Hi Karl! Thanks for writing! Doesn't this format require a column for a factor for every variable present in any observation, whether or not that variable is present in the observation in question? I think I end up with data that consists mainly of columns of variables that are NAs for all but a few years.
But let me take a closer look at the data format and see. Again, thanks! --andrewH On Tue, Jan 15, 2013 at 9:22 AM, andrewH <ahoer...@rprogress.org> wrote: > 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. > -- J. Andrew Hoerner Director, Sustainable Economics Program Redefining Progress (510) 507-4820 [[alternative HTML version deleted]] ______________________________________________ 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.
