Anonymous wrote:

Anonymous wrote:If your child has taken both, would you mind sharing the scores? i'm wondering how the two compare. Is one or the other always lower. If you have the breakdown even better. Maybe one Cogat subtest correlates better?

Two DCs:

#1
CogAT Verbal 133, Quantitative 121, Nonverbal 114, Composite 126
WISC-IV Verbal 152, Perceptual Reasoning 131, Working Memory 107, Processing Speed 100, FSIQ 133

#2
CogAT Verbal 140, Quantitative 130, Nonverbal 134, Composite 139
WISC-IV Verbal 148, Perceptual Reasoning 135, Working Memory 126, Processing Speed 123, FSIQ 144

Forgot to add the GAI for DC#1 was 151

Anonymous wrote:If your child has taken both, would you mind sharing the scores? i'm wondering how the two compare. Is one or the other always lower. If you have the breakdown even better. Maybe one Cogat subtest correlates better?

Two DCs:

#1
CogAT Verbal 133, Quantitative 121, Nonverbal 114, Composite 126
WISC-IV Verbal 152, Perceptual Reasoning 131, Working Memory 107, Processing Speed 100, FSIQ 133

#2
CogAT Verbal 140, Quantitative 130, Nonverbal 134, Composite 139
WISC-IV Verbal 148, Perceptual Reasoning 135, Working Memory 126, Processing Speed 123, FSIQ 144

Anonymous wrote:Therefore, a score of 130 on the WISC is equivalent in rarity to a 132 on the cogat.

Based on this, DC's scores were identical - 130 on WISC and 132 on Cogat. NNat was 152 - not sure how it fits into the picture. WISC showed low processing speed; psychologist mentioned the possibility of inattentive ADD.

Anonymous wrote:If your child has taken both, would you mind sharing the scores? i'm wondering how the two compare. Is one or the other always lower. If you have the breakdown even better. Maybe one Cogat subtest correlates better?

Since both tests are based on percentiles, it wouldn't make sense for one test to produce higher scores than the other. Some kids will do better on the cogat or NNAT, some will do better on the WISC, some will have close scores on all tests. The only difference I can think of worth mentioning is that the cogat has a standard deviation of 16, while the Wisc has a standard deviation of 15. Therefore, a score of 130 on the WISC is equivalent in rarity to a 132 on the cogat.

The WISC is said to be a more accurate test, since it is done one on one, while the cogat and NNAT tests are administered in a group setting.

My child's Wisc, NNAT and Cogat were all within 1-2 points of each other.

Anonymous wrote:

Anonymous wrote:Both my DC's were quite close- within 3-5 points.

8:10 here. Then it's likely you have an accurate assessment of current cognitive functioning. There are quite a few students who don't do as well on the CogAT due to classroom distractions, slow motor speed, skip a row, etc. In those cases, it's encouraging to see stronger WISC results.

Actually, one of my DC's has severe LDs and scores quite low on one section of the WISC and extremely high on others. I agree that the WSIC gives much more information into the assets and deficits each student possesses.

Both kids had lower CogAT than WISC, most likely due to ADHD.

Yes, here too. The child with severe ADHD had very low percentiles on CogAT (one subtest was 6th percentile!) whereas WISC scores were all superior except for Processing Speed (50th percentile).

Both kids had lower CogAT than WISC, most likely due to ADHD.

140s on CogAT and NNAT, 150s on WISC IV

Anonymous wrote:Isn't the WISC a longer test that typically runs for 3 hours?

Depends on the child, but I think of 75 - 90 minutes as more typical.

Anonymous wrote:Both my DC's were quite close- within 3-5 points.

8:10 here. Then it's likely you have an accurate assessment of current cognitive functioning. There are quite a few students who don't do as well on the CogAT due to classroom distractions, slow motor speed, skip a row, etc. In those cases, it's encouraging to see stronger WISC results.

Isn't the WISC a longer test that typically runs for 3 hours?

Both my DC's were quite close- within 3-5 points.

The CogAT is a group-administered, paper-pencil ability test. Since the WISC (there's now a WISC-V) is individually administered with verbal and nonverbal subtests, I view the latter as much more helpful in providing information re processing strengths and weaknesses (auditory and visual memory, abstract verbal reasoning, psychomotor speed, expressive vocabulary skills, nonverbal reasoning with abstract symbols, etc). The resulting overall scores may be consistent. If not, I would consider the WISC scores as much more meaningful.

If your child has taken both, would you mind sharing the scores? i'm wondering how the two compare. Is one or the other always lower. If you have the breakdown even better. Maybe one Cogat subtest correlates better?