On Fri, 21 Oct 2011, Weidong Gu wrote:
No easy way out with missing data problems, all imputations are based on
some strong and untestable assumptions.
Thanks for the insights.
Let me rephrase my question in a way that should work: is there a way to
subset my comprehensive data frame ('chemdata') to select only those rows
that have values for two different parameters (i.e., in the same column)?
I suspect not. But, I can select from the database table on those criteria
and read in a new R data frame.
Rich
______________________________________________
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.
