The Cerebrals Cognitive Ability Tests (CCAT)

[Xavier Jouve]

I've re-uploaded the Crystallized-Educational tests of the CCAT. Scoring is automatically done and raw scores along with confidence intervals for standard scores are provided.

Unfortunately, because of an hard drive crash I've lost most of the data about the CCAT psychometric studies. I need new test-takers.

- http://www.cerebrals.org/index.php?go=tests

[Thales]

Hi Xavier. It's nice to see that you've returned to the board.

Is the CCAT available in .pdf format? I really don't have patience for tests administered online.

If so, please PM me and I'll send you my email.

Regards,
Stefan

[Xavier Jouve]

I'm sorry, I don't have the actual test in pdf. Well maybe in the future.

[Xavier Jouve]

I've revised the crystallized-educational scale.

- Performed a 2 Parameters Logistic Model analysis: problematic items were identified on the basis of Item Characteristic Curves and Common Factor Model Reparameterization Item Loadings.
- Extended the range of acceptable keys for few problematic verbal analogies and sometimes removed/replaced the one expected by the author.
- Renormed (from 8:4 to 75 years old) both the Full (Crystallized-Educational) and the Verbal (Verbal Ability) scales on the Verbal Ability Index of the Reynolds Intellectual Assessment Scales thanks to their very close relationship.
- Started the writing of a psychometric properties paper for the Crystallized-Educational CCAT.

- CCAT Criterion-Related-Validity (pdf)
- CCAT Reliability (pdf)
- CCAT Age Referenced Norms for Verbal Analogies and General Knowledge Combined For Ages 14:8 to 54 Years (pdf)
- Draft version of the Psychometric Properties paper (pdf)

The next revision will include at least two nonverbal subtests (maybe a revised form of my good'ol TLAP ).

[sideways8]

A refreshing test, although I am not native to the english language, I scored resonably well on verbal and high 130's low 140's on crystalized

[Xavier Jouve]

A refreshing test, although I am not native to the english language, I scored resonably well on verbal and high 130's low 140's on crystalized

Don't be sad You've got very superior score on the Crystallized-Edu. Index (actual Full Scale) with superior (English-)Verbal Ability Index... Well for a non-english native, I don't see any reason to be sad. These are high scores for english natives as well. It makes no doubt that with a verbal scale prepared for your native language, you would have scored higher.

[sideways8]

I wasnt used to scoring that low is why I had been sad, it said crystalized intelligence was 130-141 (exact score I believe). I had expected my crystalized intelligence score to be quite close to my fluid intelligence but after some reading I had come to the conclusion that A and B are independent events. I score in the high 140's low 150's on tests that include spatial questions aswell as pattern recoginition.

As a side note: I loved the question with the insane genius and the showman, it was very enjoyable , I had trouble with the shaft question, I was unsure of what a "shaft" had been since I had never encountered such an object to my recollection.

P.S. The 130-141, would that give hint towards a score lying closer to the middle or that all areas of that range are equally possible?

[Xavier Jouve]

Your test score is close to the least upper bound of the CI range. (It would have been the contrary in case of a low Index instead of a high one)

[sideways8]

least upper bound of the CI range, what do you mean by least upper bound, closer to 141?

[Xavier Jouve]

Yes, that's right.

[sideways8]

I have a question for you Xavier, its not specific too psychlogical testing. This is an array of questions and I would hope anyone who has a sufficently structured answer to contribute. Is time cyclic? Time is percepted differently for individuals under times of danger, this was tested to be true, is it simply the area of the brain which percieves time that is effected or is there a greater force at play? I have other questions but I hope to get answers to these first.

[retorick]

It appears that several questions in Mathematical Problems, and a few in General Knowledge, are incomplete and thus rather difficult to answer. For example,

9. In a five day week, an industrial piece worker wishes to average $36.00 per week. How

10. If a genius can solve a problem in 15 minutes and another genius in 10, how long will it

Same issue with questions 11, 13, and 15 (Mathematical) and 15, 37, 44, and possibly 51 (General).

I don't believe this is a peculiarity of the computer or browser I'm using, as I've seen it in other contexts.

If this test is being maintained, there might be some interest in attending to these.

[spookje]

Hehe. That requires some divergent thinking... :-)

[Xavier Jouve]

It appears that several questions in Mathematical Problems, and a few in General Knowledge, are incomplete and thus rather difficult to answer. For example,

9. In a five day week, an industrial piece worker wishes to average $36.00 per week. How

10. If a genius can solve a problem in 15 minutes and another genius in 10, how long will it

Same issue with questions 11, 13, and 15 (Mathematical) and 15, 37, 44, and possibly 51 (General).

I don't believe this is a peculiarity of the computer or browser I'm using, as I've seen it in other contexts.

If this test is being maintained, there might be some interest in attending to these.

Thank you for your comments. Well, as long as these items show adequate psychometric properties, I don't see any reason to revise them.

I don't feel myself the ability to judge a particular item; the truth is that experience gives (one/)me a better approach, but I'm not a wizard actually. The only way I know is by performing psychometric analyses. That's a matter of honesty.

Some of those items aren't mine, and I've taken them as poeple sent them (only taking care of some unexpected answers if necessary). Then, all were (and still are) analysed with psychometric methods to figure out whether or not they are able to provide with satisfatory measurement of test-takers ability.

PS. For your reference, GK #44 is the best one so far into its subtest (I mean psychometrically/mathematically: loading at .83 on general information factor and its 2PLM Item Characteristic Curve is just amazing to say the least). - Draft version of the Psychometric Properties paper (pdf)

[Xavier Jouve]

Updated both Validity and Reliability papers.

- Reliability of the whole scale is really excellent:
--- Cronbach's alpha coefficient is even slightly better than the one of RIAS Verbal Index against which the CCAT has been normed.
--- Spearman-Brown's corrected split-half coefficient is as high as both the WAIS IQ's and VIQ's, and significantly better than the PIQ's.

- Validity is very satisfactory:
--- Pearson's correlation coefficient is at or above .80 between the CCAT and all the others crystallized-g measures that were used for comparison.