On Oct 21, 2011, at 4:38 PM, Rich Shepard wrote:
On Fri, 21 Oct 2011, David Winsemius wrote:
How are we to determine which lines contain information about the
"relationships" of param=="TDS" with whatever cases or variable has
values
of "Cond" and "SO4"? Are you really trying to compare two disjoint
groups
on some statistic like the means and std-dev of "quant"? (This
would be a
job for `aggregate`.)
When I try to select rows based on non-null contents for two values
of
'param' I don't have the correct syntax.
What problem are you trying to solve?
Perhaps I need to use multiple data
frames instead of a single one?
That seems very unlikely. What we need is a clearer description of
that values that your "param" variable can assume, and what you want
to within categories of those values. We also need you to stop
dropping context.
Rich
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David Winsemius, MD
West Hartford, CT
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