Reply to GT/AAP Appeals WISC Scores

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[quote=Anonymous][quote=Anonymous][quote][b]It may be[/b] that kids with high NNAT but lower CogAT were the ones who didn't get in first round. Kids with lower NNAT and high CogAT [b]may have[/b] gotten in first round, and didn't need to appeal as often, because CogAT is given more weight than NNAT. [/quote]

Do you know this to be true or is it speculation/anecdote? I'm 15:19 above whose kid's WISC scores correlated with NNAT more than CogAT. My kid got in first round, no appeal. We did the WISC for other reasons, school never saw it.[/quote]

I wouldn't call it speculation but more raising a possibility of why more cases of high NNAT and WISC, and lower CogAT, than cases of low NNAT and higher WISC and CogAT, may be seen on these boards. I don't have any special knowledge beyond what I've read over the years on these boards. If you read all the information over multiple years, CogAT does seem to be weighted higher than NNAT, which makes sense since CogAT is administered over three days and has six sections, whereas NNAT is one short test, more like one of the CogAT six sections. The purpose of NNAT is primarily to detect potential among non-English speakers, again just from what I have read over the years on these boards.

I thought I saw this thread veering toward a conclusion that NNAT is more closely correlated with WISC than CogAT is correlated with WISC, so I wanted to raise that the cases seen here don't necessarily support that conclusion. You [b]may[/b] have a sample weighted toward those who blew the CogAT, because that was the most important test and low NNAT wasn't as much of a disqualifier leading to the need to appeal. I don't think there's enough evidence to draw a conclusion either way.

I do see stats there is around a 0.79 correlation between CogAT and the old WISC III (see example below). I don't immediately pull up correlation numbers for NNAT and WISC so cannot compare. I believe (not a statistician) that the correlation of 0.79 is considered fairly high.

http://www.riverpub.com/products/group/cogat6/pdfs/newsletters/CS_vol1_summer04.pdf
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