Sunday, February 26, 2006

st: -pre-

Thanks to Kit Baum, a new version of -pre- has been released.

-pre- is a post-estimation command that computes the Proportional Reduction of Errors, a measure of a models predictive power. It is simply R-squared for OLS regression.

The new version of -pre- will, after logit/probit models, compute the value for the cutoff (usually set at 0.5) that maximizes the number of correct outcomes. This new version is also more flexible, allowing the computation of the Proportion Reduction of Errors based on the user's choice of central tendency. It also fixes a few bugs. The new version requires Stata 9.

To install type: ssc install pre, replace

An example: sysuse auto, clear logit foreign rep78 price turn pre pre, maxcut

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