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RE: st: RE: Interpretation of quadratic terms


From   Richard Williams <[email protected]>
To   "[email protected]" <[email protected]>, "'[email protected]'" <[email protected]>
Subject   RE: st: RE: Interpretation of quadratic terms
Date   Mon, 08 Mar 2010 17:13:54 -0500

At 05:06 PM 3/8/2010, Lachenbruch, Peter wrote:
When you think about it, the residual will be 1-predicted or 0-predicted. Thus, they will plot as two parallel straight lines.

Correct. I think that is why you don't even get the usual resid = y - yhat as an option with the predict command after logit:

    Main
      pr            probability of a positive outcome; the default
      xb            xb, fitted values
      stdp          standard error of the prediction
    * dbeta         Pregibon Delta-Beta influence statistic
    * deviance      deviance residual
    * dx2           Hosmer and Lemeshow Delta chi-squared influence statistic
    * ddeviance     Hosmer and Lemeshow Delta-D influence statistic
    * hat           Pregibon leverage
    * number        sequential number of the covariate pattern
* residuals Pearson residuals; adjusted for number sharing covariate pattern * rstandard standardized Pearson residuals; adjusted for number sharing covariate pattern
      score         first derivative of the log likelihood with respect to xb



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Richard Williams, Notre Dame Dept of Sociology
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