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...fcn_create_nonissuing_match_by_quarterssinceissue = function(tfdata, quarters_since_issue=40) { result = matrix(nrow=0, ncol=ncol(tfdata)) # rbind for matrix is cheaper, so typecast the result to matrix colnames = names(tfdata) quarterends = sort(unique(tfdata$DATE)) for (aquarter in quarterends) { tfdata_quarter = tfdata[tfdata$DATE == aquarter, ] tfdata_quarter_fitting_nonissuers = tfdata_quarter[ (tfdata_quarter$Quarters.Since.Latest.Issue > quarters_since_issue) & (tfdata_quarter$IPO.Flag == 0), ] tfdata_quarter_ipoissuers = tfdata_...

...r list members, I have got another problem. I imported an SPSS file with the Memisc package using the following commands: mz <- spss.system.file("myspssfile.sav") mz <- subset(mz,select=c( bsex,balt,xurb,dtaet,kartab,bgeb,boseit,bgeblan,xnuts2,kausb,xerwstat, asbper,asbhh,ajahr,aquartal,bstaat,xwieoft,gew1,apkz,bpkzm,bpkzv)) Afterwards I checked the measurements of the variables and they are all right for most of them (e.g. the variable containing the sex of a person is "nominal" and the variable containing the year is "interval"). For two of the variables t...

I want to take the first row of each unique ID value from a data frame. For instance > ddTable <- data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry")) I want a dataset that is Id Name 1 Paul 2 Bob > unique(ddTable) Will give me all 4 rows, and > unique(ddTable$Id) Will give me c(1,2), but not accompanied by the name column.