I'm not able to create the proper syntax to specify a lattice bwplot() for
only one of two conditioning factors.
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.
Rich
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