Psychometric Tests Singapore, BPS Level A & B Singapore, Apollo Profile, Identity Self-Perception Questionnaire, Saville Wave, HR Training & Management Consulting, Hong Kong    
Sitemap Search Email PsyAsia International Telephone Numbers & Postal Addresses
Australian Psychological Society Psychologist in Singapore & Hong Kong
Psychometric Test Singapore, Hong Kong, Malaysia, Asia Human Resource Training Singapore, Hong Kong, Malaysia, Asia HRM & Business Psychology Consulting Asia Support & Accounts About PsyAsia: Asia's Leader in Psychometric Training Miscellaneous Links
Psychometric Testing & HRM Blog

Posts Tagged ‘ validity of psychometrics ’

Easy way to understand psychometric test validity

Monday, September 6th, 2010

Yesterday I was watching a program from the UK which fights for consumer rights. A segment of the program was reporting on a sofa that was not fit for purpose and this led my mind back to psychometrics.  We’re always looking for easy ways to define some of the more technical aspects of psychometrics and this was a good example!

The sofa looked absolutely fine. In fact, it was beautiful leather and looked very expensive.  To relate this back to psychometric testing we could say it had FACE VALIDITY. The sofa looked as if it would do the job it is supposed to do (on the face of it).  Likewise, a test, be it personality or aptitude, which looks like it will do the job it is supposed to do is said to have face validity.  We assess face validity simply by looking at the test. However, face validity is not very important in the grand scheme of things! It’s important for candidate buy-in of course. If you are given a test as part of a selection process and that test doesn’t seem relevant to the job you won’t be happy with the process and may not take it or the company too seriously!!

The sofa, despite looking great, had some major problems.  The first time its owner sat on it, it fell apart. There were lots of flaws in the design and so on. Likewise, some of us may have experienced similar examples with second-hand cars. They may look excellent on the face of it, but then they break down on the way home!  In other words, the sofa or the car are not FIT FOR PURPOSE. This is a major problem.  You use psychometric tests to help discriminate between candidates and to help you select the best. If there is something fundamentally wrong with the design of the test that causes any problems, then the test will not be fit for purpose. It will not be valid, even if it has face validity.

It’s for this reason that it’s not a good idea to ask a test supplier for a free trial to “validate the test” as some of our clients ask! Often this is similar to a second-hand car buyer looking at the paintwork on the car and ignoring the mechanics because they know little about them.

If you are interested in learning how to evaluate the “mechanics” of the many psychometric tests out there and knowing how to choose good from bad based on critical information, please consider attending either our face-to-face psychometric training courses in Singapore and Hong Kong or joining our live online or distance learning in psychometrics. Full details here: http://www.psyasia.com/psychometric_training.php

Chinese Personality Testing – Can Indigenous Tests Predict Work Performance?

Friday, July 30th, 2010

It’s perhaps quite natural to believe that the Chinese personality is so different to others that it requires a special psychometric test to assess it. What better way to sell your new Chinese personality test than to state that it is “high time a test for the Chinese” were developed. However, this throws doubt upon the utility of rigorously developed international psychometric tests of personality.

Given the above, we embarked on a research program to assess whether Chinese people differ significantly comparied to others in terms of personality structure and whether personality tests that purport to assess Chinese Personality are able to predict any more work performance than internationally developed tests have already been proven to do!

You can read our research findings it: personality.cn, our Chinese Personality at Work Research Site.

No time to read the whole site? Here’s a quick summary:

Locally developed psychometric tests which purport to assess “indigenous” aspects of Chinese Personality were found to be less reliable than reputable internationally developed tests of personality. Furthermore, there is a big question as to whether so-called “indigenous” traits are Chinese-specific. Issues such as traditionalism or face also exist in other cultures! Moreover, the research has demonstrated that whatever we choose to believe about Chinese Personality, locally developed (Hong Kong) tests of “indigenous” personality add nothing to the prediction of performance at work that is not already accounted for by reputable internationally developed personality tests.

We present this research in a free HRM webinar which you can watch here. We held a vote at the beginning and end of our webinar whereby we asked attendees if they believed that Chinese Personality is so different that Chinese people need their own personality test. At the beginning of the webinar, the majority of the attendees said yes! By the end of the webinar only one attendee still believed this to be the case! We recommend choosing well designed psychometric tests with high reliability and validity. Personality is a universal construct, thus locally developed tests may have little benefit to the hiring manager!

Chinese Personality at Work – How Chinese are the Chinese?

Wednesday, May 19th, 2010

FREE HRM WEBINAR

PsyAsia International is pleased to announce the next webinar in our series of professional HR webinars. This time we will be discussing the topic of Chinese Personality and performance at work.

Some HR people in Asia believe that culture plays such a significant role in personality that indigenous personality attributes need to be assessed at recruitment/selection. To this end, personality tests have been developed “in Chinese for the Chinese by the Chinese”. A significant question to ask is: Do these tests add any prediction over and above that afforded by mainstream personality tests developed by world renowned experts in the field?

The above questions will be answered through discussion of the trait model of personality and its biological basis. Peer-reviewed and published research conducted by PsyAsia International’s award-winning Psychologist, Dr. Graham Tyler; award-winning Dr. Peter Newcombe of the University of Queensland; and world-renowned Professor Paul Barrett, formerly of the University of Auckland will be presented in an easy to understand format.

Click to register…

Free training in psychometric tests in Singapore and Hong Kong

Tuesday, March 23rd, 2010
Free Psychometric Test Training in Singapore

PsyAsia International offers Free Psychometric Testing Course in Hong Kong & Singapore

Introduction to Psychometric Testing Course: Hong Kong, 4 May 2010; Singapore, 11 May 2010

PsyAsia International is Asia’s independent Leader in Psychometric Test products and Training. We choose to distribute only the world’s best, most validated psychometric assessments and offer locally relevant, world-class training in psychometrics. The Introduction to Psychometrics Workshop expands on PsyAsia’s expertise in Psychometric Training in Asia by offering a course geared to those with very little experience or understanding in Psychometrics. Many first time clients don’t understand why they need to be careful in their choice or use of psychometrics and many do not understand why training is a necessity in competent test use.

This one-day course aims to provide experienced-based training in an accessible and economical way. The course is easy to understand and yet covers many of the important issues to be aware of when choosing and using psychometric tests. Given our passion for Asia and our passion for the competent use of psychometric tests in Asia, PsyAsia makes no profit on this course. We charge delegates a small fee that reflects the cost of the hotel venue (including buffet lunch and refreshments) where the training is held as well as materials that we provide to the delegates. What’s more, if you later decide to attend one of our accreditation courses in Psychometrics, we will issue you with a discount code that reduces your course fee by the amount you paid for this course!

 
  The history of psychometric testing
Comparison of psychometric tests with other modes of employee testing and assessment
The benefit of using psychometric tests in recruitment/selection, development and coaching
Reliability in psychometric testing
Validity in psychometric testing
Error in psychometric testing
Review of different aptitude, personality and values tests on the market
Questions to ask your test publisher or distributor
What next?Note: During the workshop, delegates will create quasi-psychometric tests in groups to enable a hands-on exploration of issues such as reliability, error and validity in psychometric tests.

To view full course details and to register, please click here.

Types of Bias in Psychometric Test Translation

Friday, January 15th, 2010

Types of Bias in Psychometric Test Translation

With the demand and need for psychological tests increasing in various different cultures and countries, there has been much greater awareness regarding some of the issues that are associated with the development or adaptation of tests to be used in contexts and situations that may be different from which the test was developed for. This article focuses on one of the key aspects of translating tests, the types of bias that can occur.

When utilizing the test in a new cultural group, it is not quite as simple as directly translating the test, administering it and then comparing the results for its validity. There are a number of issues that need to be considered such as whether the area assessed with the test applies to the new culture or whether is may be biased towards that group and whether what is assessed by the test also has similar behavioral indicators? These are just some of the potential areas where bias can be found in the translation of tests and affect the validity of the test being utilized in the new context.

Van der Vijer & Hambleton (1996) differentiates between three distinct types of bias that may affect the validity of tests that have been adapted for different cultural contexts and these are construct bias, method bias and item bias.

Construct bias occurs when the construct (e.g. personality) that is measured by the test displays significant differences between the original culture for which it was developed and the new culture where it is going to be utilized. These differences can occur in the way that the construct was formulated and developed as well as in the relevant behaviors that are associated with the construct. It is critical to examine whether the underlying theory of the test is subject to construct bias and this can be examined through the studies examining the construct and its associated behaviors in the context that it will be utilized in. If there are significant differences found in these studies, it may indicative that there is construct bias. Major revisions may be required to overcome this bias. If not, the validity of the test will be affected.

Method bias refers to factors or issues related to the administration of the test that may affect the validity of the test. Examples of areas that method bias can occur include social desirability, acquiescence response styles, the conditions in which the test was conducted and the motivation of the respondents. Across cultures, there potentially can be differences that can occur in these areas and these can affect the way that the respondents answer the items in the test. This potentially may lead to differences between found that can be erroneously attributed to cultural differences when in fact, these differences are the result of differences in the administration procedures. As a result, it is threat to the validity of tests that have been adapted for use in new cultures. Test developers also not only need to focus on the adaptation of the test itself but also need to be aware of issues regarding the implementation of the test in a new context.

Item bias is another source of bias that can occur in the translation of tests and these refer to biases that occur with the items in the test. This is usually the result of either poor translation choices for items or due to culturally inappropriate translations. For example, the phrase “kick the bucket” is essentially a phrase that referring to passing away in the Western context and is commonly known by most people in that culture; unfortunately, this phrase would have no meaning for people from cultures without any prior experience with that phrase. In this manner, a literal translation of that phrase would be a poor translation as it does not convey the correct meaning of the item. The items in the test need to be culturally equivalent, where the meaning of the items needs to be correctly translated so as to maintain the validity of the test in the new cultural context.

These are some of the biases that may occur during the translation of tests. Test developers will need to be aware of the sources of bias and take the appropriate measures to avoid these biases.

References:

Van der Vijer, F. and Hambleton, R. K. (1996). Translating tests: some practical guidelines. European Psychologist, 1, 89-99.

Psychometric Training in Singapore, Hong Kong, Malaysia, and China
If you are serious about using psychometric tests properly then we recommend joining PsyAsia International’s Psychometric Assessment at Work Course which leads to a certificate of competence in Occupational Testing Level A and Level B from the British Psychological Society. The Course is run publically in Singapore and Hong Kong or in-house anywhere.
More details about BPS Level A and B in Singapore and Hong Kong

Online Psychometric Training – Worldwide
Alternatively, you might be interested in introductory Online Psychometric Test Training presented live by a registered psychologist. PsyAsia is offering a special fee of just US$12 for anybody who registers for the February online psychometric training course!
More details about online psychometric test training

Free Webinar – Identity Self-Perception Questionnaire

Monday, December 7th, 2009

Identity Psychometric Personality Questionnaire Webinar

Identity Psychometric Personality Questionnaire Webinar


Attendees will be introduced to this personality assessment which produces the most comprehensive assessment of personality on the market. Key decision-makers will also have an opportunity to trial Identity.

-Overview of the Identity Self Perception Questionnaire
-Scales of Identity
-Derived Psychological Models
-Identity Reports
-Identity Online
-Benefits of Identity
-Applications of Identity
-Comparison with other leading questionnaires
-Identity Accreditation

Click here to register

Singapore Psychometric Tests, Personality Tests, Aptitude Tests and Psychometric Training

Friday, November 20th, 2009

The Market for Psychometrics in Singapore

There are so many Psychometric Tests on the market in Singapore now, the task of choosing the right one is not easy. Choice is always a good thing, however as humans we often look for easy or stereotypical ways of making those choices and they are not always the best ones to make. For example, a client of ours was preparing for an upcoming team-building session. He approached us asking if we had a certain test that he could use in that session. Our answer was that we don’t supply that test for various very good reasons. The client’s response was “but so many people use it”. This is a typical response.   Another potential client had been looking around in Singapore for Psychometric Personality Tests to use in his training sessions as an added benefit.  He categorically advised us that he was not interested in validity and was looking for something simple and cheap!  The reality here is that at best he is wasting his time and the time of those who will complete his tests.  At worst and most likely, his trainees will be led to believe things about themselves which frankly may not be true (reliable or valid!).

Science, Psychology, Psychometrics and the Real World of Business

As busy professionals we often assume that if lots of other people are using a test it must be a good one. This is a huge mistake. Our evolution has programmed us to be seduced by glossy advertising materials and confident, friendly salespeople. On the other hand, we have a tendency to be turned off by less glossy scientific figures, statistics and perhaps psychologists such as myself who speak about the science and real value behind a test, its validity! Ultimately then, both our clients and ourselves as psychologists have problems to overcome!!

Psychologists have to be able to explain in more “glossy” terms about the technical properties of a test and our clients, usually the HR and aligned professions, are invited to turn their ears our way for a little while, just long enough to get the notion that there is more to a psychometric test than meets the eye!

Technical Properties of Psychometric Tests

When we talk of the technical properties of a psychometric test, we are referring to things such as its reliability and validity as well as how it was constructed. If a test is constructed well, it will take time. Not months, often years. The test will also evolve over time such that more and validity data will be added to its manuals. This process is costly, hence good tests cost money.

If you come across cheap tests, that should start to ring alarm bells. It’s possible to write a few questions on a napkin in a restaurant and call it psychometric and even try to sell it. If it looks good and the questions look relevant perhaps it will sell and gain a huge following. But how reliable is that test?

In other words, can it provide consistent measurement of your candidate? If your bathroom scales provide different results each time you weight yourself you take them back and say these are not reliable. Likewise with a test, you need to ensure that it is consistently assessing the constructs that it purports to assess. We often come across new clients who are shocked when we tell them that good personality tests often contain around 200 questions. However, buyer beware! We know that the longer the test, the more reliable the results (as long as it is not so long that the candidate falls asleep!).

An unreliable test can not be a valid test, hence reliability is a precursor to validity. However, validity is arguably the most important aspect of a test. You choose to use tests because you want them to illustrate where a candidate stands in terms of their ability or personality or in order to predict how your candidate will perform or behave in a job. The test’s ability to meet this need is referred to as validity.

Some tests on the market are simply more valid that others. In fact, one test in the past year has proven to be more valid than all other tests it was compared with on the market!  How come users stay with their current test then? Perhaps because of preference, habit, price, mass-following and so on. However, do ask yourself and your test supplier, how valid is your test – this is the single most important technical property in a psychometric test!

Sometimes tests which are more valid will be more expensive but this makes sense. If a test took a long time to develop, was developed well and by a reputable publisher and is based on well founded theories that have been researched internationally, then surely it is worth paying the extra as such a test will provide an excellent return on investment with its strong validity.

Training to use Psychometric Tests in Singapore

Properly developed psychometric tests require proper training to be used competently. If your test supplier requires that you undergo very limited or no training, this is a reflection of the test as well as their lack of understanding of psychometrics. You need to understand the concepts referred to above, as well as error in testing and how to make decisions based on test results, let alone how to feed back results properly to candidates and decision-makers. The type of questions (i.e., forced choice versus rating scales) will also dictate how you can use the results – you need to be trained to understand this! In some parts of the world (South Africa for example), only psychologists can use psychometric tests. Whilst this is a strict rule, it has its logical basis in how easy it is for untrained professionals to use tests wrongly.

Purchasing Psychometric Tests in Singapore

You may also wish to consider where you purchase your tests from, particularly in Singapore. In recent years we have seen an influx of profiteers in the industry who seek to make money but lack any depth of understanding in psychometrics or psychology at work. This will change in time as psychology in Singapore develops. For now however, be wary of this and we suggest that you only purchase psychometric tests from fully registered organisational psychologists who have a firm grounding in personality, psychometrics and psychology at work and who are answerable to professional competence and ethics boards.  Many of those selling psychometric tests in Singapore are simply not answerable to anybody in terms of their conduct or competence.  You can therefore not be certain that any advice they provide is relevant, up-to-date or will work in your organisation.

There are many more things to be aware of when choosing psychometric tests in Singapore. We cannot entertain them all here due to space constraints. You may wish to look out for training courses in Psychometric Assessment such as our our Psychometric Assessment at Work training which leads to the internationally recognised British Psychological Society Level A and B Certificates of Competence in Occupational Testing.  Such courses will prepare you further for choosing the right test and therein avoid costly selection and development mistakes. Look for courses run by experts in psychometrics who are based in Singapore and hence have a strong understanding of test use aligned with local culture, laws and practice.

Note: some Singapore firms will ship in overseas trainers to run psychometric training.  We suggest you avoid this training reseller model given that the facilitator is based overseas and is thus likely to lack knowledge of the Singapore business/legal and cultural environment for Psychometric Testing.

This article is Copyright PsyAsia International Pte Ltd.
It was originally written for Human Resources Magazine in Singapore
A shorter version of the article appears in the magazine’s November 2009 issue

Comparing psychometric test results between candidates

Monday, August 24th, 2009

The first thing to remember is that if you are using a purely ipsative personality test then you should not be comparing test results between candidates.  Ipsative tests are self-referencing – they are comprised of force-choice items.  They are useful in coaching, team-building and career guidance, but should not be used alone in recruitment and selection scenarios.

Some tests on the market, such as the Saville Consulting Wave or the Apollo Profile are joint normative-ipsative tests and these would be fine to be used to compare between candidates.  A normative test is one which allows the candidate to respond based on the strength of their agreement or disagreement with a statement. The end results are then compared with a group of similar others who have previously taken the test (the norm group). 

Purely normative tests such as the Identity Self-Perception Questionnaire would also be good to use for comparing candidates.  Aptitude tests are by their nature normative tests and hence can be used to compare between candidates. 

So, let’s assume that we have administered a normative personality assessment to two candidates and we are particularly interested in finding a candidate with a high tendency towards creative thinking.  We have decided to use a personality assessment alongside other means of assessment including an abstract reasoning test to assess this.  We ask  Lee and Jane to complete both of these tests.  These are their scores on the test scale of interest (presented in sten scores):

Lee
Creative thinking:8

Jane
Creative thinking:6

Now, keeping in mind that we would never use test results on their own to make a decision, let’s look at how most decision-makers would approach the above scenario based on test results alone for simplicity.

It obviously appears that Lee is somewhat better suited to the position than Jane.

However, in psychometric testing just as in any assessment procedure undertaken for Human Resources, there is always a chance of error.  In fact, it’s more than chance!  We know that error is always present. 

When interviewing somebody the error is present, when running an assessment center the error is also present.  Likewise, error is also present in the use of psychometric tests.  Given a desire to be scientific, reputable test publishers will actually assess their tests for error. 

One way of doing this is to ask a group of respondents to complete the test today and to invite them back a month later to complete the same test.  Ignoring practice effects (which are controlled for), the expectation is that there should be a strong relationship between how a candidate scored at time one and how they score at time two.  The idea is that test results should remain consistent over time.  Psychometricians refer to this as test-retest reliability.

We hope for high test-retest reliability and we really should be choosing tests which have proven high levels.  If we don’t we will have little confidence in test results and be very limited in terms of how we use them.

The assessment for error that shows us how much confidence we can have in test scores is referred to as the standard error of measurement (SEM).  It uses an equation to ascertain how confident we can be that a candidate’s test result is a reflection of their true score as opposed to their true score PLUS error.

The equation is very simple, it is just: Standard Deviation multiplied by the square root of 1 minus the test-retest reliability of the assessment.  If you don’t like statistics, sorry – they really are necessary to use tests competently!

If you choose a reputable test, often the publisher will quote the SEM in the test manual.  If not, you can use the equation above to calculate it.  You would use the standard deviation for your scale of interest taken from the manual alongside the test-retest from the manual (note…if your publisher fails to provide these figures you should probably not be using their tests!!). 

The point is that the lower the SEM (or the higher the test-retest reliability), the better.  Why?

Going back to Lee and Jane above.  If our test has an SEM of 1.5 STENS, this would mean that we are 68% confident that Lee’s true score for the creative thinking scale is between 6.5 and 9.5 (we add and subtract the SEM from the observed score).  It would also mean that we are 68% certain that Jane’s true score lies between 4.5 and 7.5 on the same test.

Now we can see that some doubt begins to arise as to whether the differences observed between the two candidates is as a result of a real score difference or an error difference (i.e., the true score for both candidates could be 7!).  We don’t want to make a mistake and choose the wrong candidate, so let’s now look at how we can compare the differences.

We can take this further and calculate something called the standard error of difference. This tells us how confident we can be that there is a true difference between the scores of the two candidates.  Because both candidates completed the same test, we use the following equation: SEdiff= the square root of (1.414 * SEM squared of the test in question). 

Let’s say that our test has an SEM of 1.5 STENS.  Using the SEdiff equation, we get a figure of 3.18 for the SEdiff. This represents our “critical figure”. It means that the difference between the candidate’s scores must be at least 3.18 before we can conclude there is a true score difference.

In our example, the difference between the candidate’s scores is only 2.  Hence we cannot conclude there is a true score difference.  The implication for selection is that we should not (everything else being equal) select one candidate over the other because, although we observe differences, the differences may not be true differences, they may be simply error differences.

Note that if we choose a more reliable test it will reduce the SEM.  So for example, if we have an SEM of 1 STEN, our SEdiff for the above example would be 1.19.  In this case, since the difference between the candidate’s scores is 2 STENS, we could conclude that there is a true difference.  We would be at least 68% certain and almost 96% certain.  We won’t go into degrees of certainty in this article, but the point is made!

In summary, do not compare candidate’s test results without a knowledge of the test’s reliability and standard deviation or in other words, do not ignore the SEM.  Every assessment technique has an error variable.  Competent users of psychometric tests will be aware of this and ensure they do not make the wrong selection decision or give incorrect development/careers advice on the basis on error rather than true score differences. 

This article is (C) 2009 PsyAsia International. Some websites have been given permission to post this article.  The article must always contain our copyright, publisher details and a live link to our website. Please do not violate these terms.

 
  • Recent Posts

  • Categories

  • Tags

  • Archives

  •   Page copy protected against web site content infringement by Copyscape. Offenders will be detected and reported to their webhost, ISP and local government RSS feed for our News Section