On 30/06/14 10:32, Dr Eberhard W Lisse wrote:
Thanks, I then set NA to 0, and can do the sutraction, great.
Not so great. I haven't gone through the issues underlying this post, but replacing NA by 0 will almost surely yield nonsense. "Missing" is ***not*** the same thing as "zero". Pretending that it is will have disastrous consequences. Think through what you are trying to do more clearly.
cheers, Rolf Turner ______________________________________________ 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.
