[amelia] Problems with amelia

Hello, I am just starting to work with Amelia. The examples from the vignette work all fine, but when I use my own dataset which is being imported from a *.csv, I get the error message "WError in matrix(1, AMn, 1) : non-numeric matrix extent", which is a mystery to me. Since I am working on computer with a German locale (WinXP) it might have something to do with the imported dataframe. However, from the error message I cannot spot the problem. Attached you find a minimal script and *.csv that should reproduce the error. Any hint how to handle this problem would be greatly appreciated. With best regards from Berlin, Albrecht Gradmann P.S.: This is my first post to an R-related helplist. Please let me know if essential information is missing or improperly posted. ## Minimal script to reproduce error ## ## startup-stuff library(reshape) library(Amelia) ## read.csv that ## - considers ":" as NA ## - skips the first 10 rows that are used to supply metainfo ## - does not alter the column names by adding Xes (Stata-convention) ## name.dates <- read.csv2("minimal.csv",na.strings = ":",skip=10,check.names=FALSE) # drop superfluous las column name.dates <- name.dates[,1:13] ## melt and reshape so that the year information is put in colums melt.dates <- melt(name.dates, id = c("Indicator","Group","Country")) head(melt.dates) # Change modes to make summary look like summary(freetrade) from # Amelia tutorial melt.dates$value<-as.numeric(melt.dates$value) melt.dates$variable <- as.character(melt.dates$variable) melt.dates$variable <- as.integer(melt.dates$variable) melt.dates$Country <- as.character(melt.dates$Country) summary(melt.dates) head(melt.dates) ## Start using Amelia ## amelia(melt.dates,m=1,ts="variable",cs="Country",idvars=c("Indicator","Group")) # --> WError in matrix(1, AMn, 1) : non-numeric matrix extent amelia(melt.dates[,c("Country","variable","value")],m=1,ts="variable",cs="Country") # --> WError in matrix(1, AMn, 1) : non-numeric matrix extent