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Hello R-ers, I'm trying to do a weighted principal components analysis. I couldn't find any such option with princomp or prcomp. Does anyone know of a package or way to do this? More specifically, the observations I...

Hello, I have several very large data sets (1-7 million observations, sometimes hundreds of variables) that I'm trying to work with in R, and memory seems to be a big issue. I'm currently using a 2 GB...

Hi all, I'm trying to improve my R skills and make my programming more efficient and succinct. I can solve the following question, but wonder if there's a better way to do it: I'm trying to calculate...

Hi all, Quick question: What function can I use to draw a line in the margin of a plot? segments() and lines() both stop at the margin. In case the answer depends on exactly what I'm trying to do...

Hello, I've been using a pre-release version of R v 2.8.0 for Windows for the last couple months. I think that there have been consistent problems with subsetting data sets, but I had usually been able...

Hello, I am trying to print a table with numbers all rounded to the same number of digits (one after the decimal), but R seems to want to not print ".0" for integers. I can go in and fix it...

Hi R users, I am trying to assign ages to age classes for a large data set (123,000 records), and using a for-loop was too slow, so I wrote a function and used apply. However, the function does...

Hi all, I am trying to convert a data set of physician death codings (each individual's cause of death is coded by multiple physicians) from long to wide format, but the "reshape" function doesn't seem to work because...