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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