On May 3, 2013, at 21:36 , David Winsemius wrote: > > On May 3, 2013, at 10:46 AM, peter dalgaard wrote: >> >> >> Because comparison with an unknown value yields an unknown result. > > Anything else would violate the Second Law of Thermodynamics. We cannot have > comparisons reducing entropy, now can we? Uncertainty cannot run uphill.
Now what does this say about SAS, where the missing value is smaller than all regular numbers? I.e., DATA; iteen = (age < 20); turns people of unknown age into instant teenagers. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.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.
