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July 11, 2011


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Matthew Reid Krell

Given the closeness of fit for New York and California, I wonder if you controlled for each state's size effect.

Matthew Reid Krell

And this one I'm less sure of, but I think that you're supposed to use a linear regression for ratio-interval DVs.


I used a Generalized Linear Model with a logit link function. I treated the data as a number of events (passes) occurring in a set of trials (takers)and used the binomial distribution.

The resulting "curve" is very close to linear. In this case, the correlation coefficient for (cut score, passage rate) is slightly higher the coefficient for (cut score, logit(passage rate))(-.603 vs. -0.568, both significant at or above the 1% level).

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