R help - Feb 2006 - problems with bootstrapping (Divergence or singularity ???)

while bootstrapping my fitted model for an internal validation:

fit<-lrm(y~a+b+c ,x=T,y=T)<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p>

val<-validate.lrm(fit,B=300,bw=T,rule="aic")

 R brings the notice that in some cases of the iterative process no variable has
been choosen for estimation("Divergence or singularity in 129
samples").
I can´t quite figure out why and what this means for my goodness of fit

Someone know more?

best regards 

chris


	
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