csv - Using reduce... merge in R causes extensive duplication -


i have 13 csv files each 315-320 observations of total of 26 variables plus id column merge in r. attempted using following code:

filenames<-list.files(path="mergefolder") mergedata<-llply(filenames, read.csv) allcases<-reduce(function(x,y) {merge(x,y, all=t, by="studyid")},mergedata, accumulate=f)

however, final product (allcases) file extensive replication total of 3422736 obs.

can point me doing wrong?

thanks in advance.


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