Dear Folks-- Is there a data frame analog to sparse matrices? I am working with a panel data set that has a large number of variables that are redefined repeatedly or exist for only a few years (out of 48). In my current structure, where variables are columns and rows are years, more than 90 percent of the cells and more than 3/4 of the total size of my file are NAs.
I am wondering if there is an alternate file specification currently available that still allows numeric, character and factor data to be stored. Besides just using a database. A pointer in the right direction (or a solid "no" if that is the truth) would be greatly appreciated. Sincerely, andrewH -- View this message in context: http://r.789695.n4.nabble.com/Sparse-dataframes-tp4655614.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
