Reply to To those who think A 145 cogat or nnat score is not rare, you are wrong.

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Reply to "To those who think A 145 cogat or nnat score is not rare, you are wrong."

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[quote=Anonymous]Many post on here its not rare to see nnat or cogat of 145 but say it is rare to see 145 iq scores.  The reason this is wrong is simple.  In general they are scored the same way.  Granted nnat/cogat are supposed to be scored at a standard deviation of 15 instead of 16 they both show significant rarity.  Google iq rarity to view to rarity chart.  For example an iq of 145 with standard deviation of 15 means the rarity is 1 out of 741 nationally.  With an iq of 145 and standard deviation of 16 which is what I believe nnat cogat is using the rarity goes to 1 out of 407 nationally.  So with fairfax county I think you can expext the students to be well ahead of the national average.  As a guess I would say that rarity goes to 1 out of 200 for students scoring over 145 on one of the tests.  With 13000 2nd grade students that means I would forecast 65 to have scored 145or better on any one of the tests.  Lets say we go back to a 16 standard deviation for iq tests for fairfax county I would forecast 35 students have above a145 iq.  13000/741 for national rarity then a fairfax county adjusted forecast times two the national average to come up with 35.  In general whether its a 145nnat /cogat or iq test the rarities should be close since they are scored basically  the same way.  To say a 145 nnat or cogat is common in relation to iq is wrong again because the methodology for scoring has to be very close.  Only question is standard deviation used but even with that the rarities still cant be that far off unless you think 35 of 13000 is rare but 65 of 13000 is not.[/quote]

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