Gary King's Amelia package for R and a stand alone version does EM algorithm multiple imputation.
Joe King 206-913-2912 j...@joepking.com "Never throughout history has a man who lived a life of ease left a name worth remembering." --Theodore Roosevelt -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Frank E Harrell Jr Sent: Sunday, February 14, 2010 9:39 AM To: Patrick Burns Cc: r-help@r-project.org; john.macin...@ed.ac.uk Subject: Re: [R] Multiple missing values Patrick Burns wrote: > I can think of a few solutions, none perfect. > > * You could have a master dataset that has the > missing value codes you want, and a dataset that > you use which is a copy of it with real NA's in it. > > * You could add an attribute that gives the types > of missing values in the various positions. The > downside is that attributes tend to disappear with > subsetting. The sas.get function in the Hmisc exemplifies that approach, and it has a subsetting method that preserves the special.miss attribute. Frank > > * If you only have two types, you might be able to > get away with using NaN as the second type of NA. > > On 14/02/2010 14:33, John wrote: >> Does anyone know, or know documentation that describes, how to declare >> multiple values in R as missing that does not involve coding them as >> NA? I >> wish to be able to treate values as missing, while still retaining codes >> that describe the reason for the value being missing. >> >> Thanks >> >> John MAcInnes >> >> >> -- Frank E Harrell Jr Professor and Chairman School of Medicine Department of Biostatistics Vanderbilt University ______________________________________________ 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. ______________________________________________ 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.
