[R] Draw a nomogram after glm

From: Komine <momadou_at_yahoo.fr>
Date: Thu, 05 May 2011 04:51:37 -0700 (PDT)


Hi all R users
I did a logistic regression with my binary variable Y (0/1) and 2 explanatory variables.
Now I try to draw my nomogram with predictive value. I visited the help of R but I have problem to understand well the example. When I use glm fonction, I have a problem, thus I use lrm. My code is: modele<-lrm(Y~L+P,data=donnee)
fun<- function(x) plogis(x-modele$coef[1]+modele$coef[2]) f <- Newlabels(modele,c(L="poids",P="taille")) nomogram(f, fun=list('Prob Y<=1'=plogis),  fun.at=c(seq(0,1,by=.1),.95,.99),

         lmgp=.1, cex.axis=.6)
         fun.at=c(.01,.05,seq(.1,.9,by=.1),.95,.99),
         lmgp=.2, cex.axis=.6)

options(Fire=NULL)
Result is bad and I have this following error message: Erreur dans value.chk(at, i, NA, -nint, Limval, type.range = "full") :   variable L does not have limits defined by datadist

Could you help me on the code to draw nomogram. Nb: my English is low, I apologize.
Thank for your help
Komine  

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Received on Thu 05 May 2011 - 14:35:17 GMT

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