Displaying 1 result from an estimated 1 matches for "tp4646948p4647203".
2012 Oct 22
6
How to use tapply with more than one variables grouped
I'm studying alone the R language for data preparation. I found a course at
MIT for data preparation that uses python but I'm using R to learning. The
first exercise is the preparation of data from a database that shows the
contributions made to candidates for U.S. president. The database is
described in FORMART