Lattice bwplot(): Conditioning on one factor
A small reproducible example, as requested bythe posting guide, would have been very helpful here (if you provide one, use ?dput to provide the data). You have also not told us what you mean by "unsuccessful," so we are left to guess what sort of problems you experienced. "None work" is completely useless to help diagnose the problem. This means we waste time going back and forth trying to elucidate what you mean. Please consider these things if/when you post in future. In any case, my guess is that param is numeric and it should be a factor, so, e.g. bwplot(quant ~ factor(param) | era, data=mg.d, main='Dissolved Magnesium', ylab='Concentration (mg/L)') might be what you want. But of course, it may be completely wrong. Cheers, Bert
On Fri, Sep 28, 2012 at 9:25 AM, David Winsemius <dwinsemius at comcast.net> wrote:
On Sep 28, 2012, at 7:49 AM, Rich Shepard wrote:
I'm not able to create the proper syntax to specify a lattice bwplot() for only one of two conditioning factors.
Wouldn't that involve specifying the 'subset' parameter (if bwplot accepts a subset argument) or using the 'subset' function to pass the desired rows to the data argument if it doesn't?
The syntax that produces a box plot of each of the two conditioning
factors is:
bwplot(quant ~ param | era, data=mg.d, main='Dissolved Magnesium', ylab='Concentration (mg/L)')
What I've tried unsuccessfully are:
bwplot(quant ~ param | factor(era=='Pre-mining'), data=mg.d,
main='Magnesium', ylab='Concentration (mg/L))
bwplot(quant ~ param | era, data=mg.d, main='Magnesium', ylab='Concentration
(mg/L)', subset=era('Pre-mining'))
plus slight variations of the above. None work.
Please point me to what I've missed in specifying only one of two
conditioning factors for the plot.
-- David Winsemius, MD Alameda, CA, USA
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Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm