On Aug 30, 2011, at 5:38 PM, Rich Shepard wrote:
On Tue, 30 Aug 2011, David Winsemius wrote:
I think you need to go back and do your input operations again with
sep="|"
David,
Yes, that's better. I did not know of the sep option. The new
results:
str(chemdata)
'data.frame': 14886 obs. of 4 variables:
$ site_id : Factor w/ 148 levels "BC-0.5","BC-1",..: 104 145 126
115 114
128 124 2 3 3 ...
$ sample_date: Factor w/ 1012 levels "1980-03-01","1980-05-01",..:
432 410
423 405 398 408 401 360 366 407 ...
$ param : Factor w/ 8 levels "Arsenic","Calcium",..: 1 1 1 1 1
1 1 1 1
1 ...
$ quant : num 0.06 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
0.01 ...
Now I can work on the commands I need.
That does look more workable. You might consider changing the dates
with:
chemadata$samp_date <- as.Date(as.character(chemdata$sample_date) )
Many thanks,
Rich
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David Winsemius, MD
West Hartford, CT
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