Hey Gents,
This subject has actually been studied in an academic setting...
1. De Ball S, Sullivan K, Horine J, Duncan WK, Replogle W.
The relationship of performance on the dental admission test and performance on Part I of the National Board Dental Examinations.
J Dent Educ. 2002 Apr;66(4):478-84. Review.
2. Kramer GA. Predictive validity of the Dental Admission Test.
J Dent Educ. 1986 Sep;50(9):526-31.
Posted by ItsGavinC:
"Over a BROAD scope you would see a correlation, but such it is with anything. For example, if you n=20 then you might not see much of any correlation. But, if n=4000 then you certainly would see a trend where those who scored higher on the DAT also scored higher on Part I."
Actually, from a statistical standpoint, this is not exactly true. Yes, it is true that generally increasing the sample size may tease out correlations that are otherwise masked, but there is a cost for doing so. Given that the ADA strives to maintain predictive validity for each of these tests, and given that their alpha error is highly unlikely to be greater than 0.05, it would be necessary, from a statistical standpoint, for the corrleations to be strong enough to be observed in a small cohort (I'd bet n < 200).
The only stipulations for such a cohort would be that the DAT/GPA/NBDE values would have to be normally distributed to represent the population of people taking these tests.
AjM