I have a dataframe of 25 columns and 100,000 rows called testdf. I wish to build a new dataframe, with 14 columns and 100,000 rows.
I wish the new dataframe to have the trailing 12 column mean. That is, I want column 1 of the new dataframe to have soemthing like: ( mean(testdf[,1:12],na.rm=T) What is the best way to accomplish this? ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
