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Hi, I would like to create a list of data frames that I could access via index manipulation. An array pointer of dataframe... for (i in 1:length(InputFilelist)) { # create data.frame temp <- read.table (file = InputFilelist[i] , header = T, skip = 4) # append data.frame InputDataFrame <<- list(InputDataFrame,temp) } Thanks in advance ! Pascal Rheaume [[alternative HTML version deleted]]

...its name and stores its value on this name. However, it does not calculate the mean of these scores (LVMean) in the same row correctly, as you can see in the below output which strangely also contains NAs. What is wrong?? Thanks for any hint!!! ###### ## start groupMeanForAllItems <- function(inputDataFrame, groupVector) { # build up result dataframe starting with group means result <- data.frame(unique(groupVector)); # build up result column labels starting with group name resultNames <- "groupname"; for (itemName in names(inputDataFrame)) { # compute mean by group tmpGroupMean <-...