stepwise selection for conditional logistic regression

Stepwise variable selection is an invalid statistical method.  Who or which
book recommended it?
Frank

Subha P. T. wrote

?Hi,

Is there any function available to do stepwise selection of variables in
Conditional(matched) logistic regression( clogit)? step, stepwise ?etc are
failing in case of conditional logistic regression. Please help.?

Thanks

P.T. Subha
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-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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