Help using Base SAS procedures

GENMOD confidence interval

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Occasional Contributor
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GENMOD confidence interval

Hi,

proc GENMOD (dist=normal & link=identity) gives different estimate for the confidence interval of the individual predicted values.

Someone  knows why?

Thanks in advance

Barbara P.

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SAS Super FREQ
Posts: 3,756

GENMOD confidence interval

Posted in reply to COMPAREMISSING

Maybe I'm misunderstanding your question, but GENMOD does not give prediction intervals for individual responses.

There are two confidence intervals that regression routines return. The familiar one is the confidence interval for the mean predicted value. (Most/All SAS regression procedures return this.)  The other is prediction limits for an individual response.  REG and GLM return this, but GENMOD does not.

For details, see the formulas for LowerM versus LowerI in the regression chapter of the SAS/STAT doc: http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_introreg_sec...

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