search for: shoaaib

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2007 Nov 22
5
testing independence of categorical variables
...that the lengths of the two vectors don't match. Suppose X and Y are two factors. X has 5 levels and Y has 7 levels. This is what i tried doing >temp<-chisq.test(x,y) but got error "the lengths of the two vectors don't match". any help will be appreciated -- Regards, Rana Shoaaib Mehmood
2007 Nov 16
7
sorting factor levels by data frequency of levels
...; I WANT THE FACTOR LEVELS TO BE SORTED IN ORDER OF DESCENDING DATA FREQUENCY IN EACH LEVEL. IN OTHER WORDS I WANT THE LEVEL WHICH HAS THE HIGHEST FREQUENCY IN STATE TO APPEAR FIRST, FOLLOWED BY ONE WHICH HAS THE SECOND HIGHEST FREQUENCY AND SO ON. Any help will be appreciated -- Regards, Rana Shoaaib Mehmood
2007 Nov 13
2
plotting coxph results using survfit() function
...=rep(mean(Y),2)) > detach() > plot(survfit(mod.phm, newdata=DataFrame.X), lty=c(1,2),ylim=c(.6,1)) Error in `contrasts<-`(`*tmp*`, value = "contr.treatment") : contrasts can be applied only to factors with 2 or more levels any help will be appreciated. -- Regards, Rana Shoaaib Mehmood
2009 Feb 12
2
R Connection with Teradata (Windows)
Hi all, I am trying to connect Teradata with R using Windows. Due I need to install any specific package or what? I am bit clue-less. Can someone help. Regards, Saj _________________________________________________________________ [[alternative HTML version deleted]]
2007 Nov 23
0
R users in Cyprus
...ality Statement: This email message, including any attachments, is for th...{{dropped:6}} ------------------------------ Message: 24 Date: Wed, 21 Nov 2007 08:29:17 -0600 (CST) From: Terry Therneau <therneau at mayo.edu> Subject: Re: [R] plotting coxph results using survfit() function To: shoaaib at gmail.com Cc: r-help at stat.math.ethz.ch Message-ID: <200711211429.lALETHF13249 at hsrnfs-101.mayo.edu> Content-Type: TEXT/plain; charset=us-ascii The survfit function, when applied to the results of a Cox model, will give the predicted survival curve for any particular combination of...