On 3/19/06, Alexander Nervedi [EMAIL PROTECTED] wrote:
apoplogies for the repeat post - i just realized i forgot to change the
subject line
I dont as yet fully understand how trellis works. Advice would be much
appreciated.
I have a factor variable (2 levels) and a continuous variable and I am able
to plot a histogram of the frequencies of the continuous variable for each
level of the factor variable using :
histogram( ~ e.ps | vdc, data = est.prop.score,
xlab = Propensity Score, type =
density,
panel = function(x, ...) {
panel.histogram(x, ...)
panel.mathdensity(dmath = dnorm, col =
black,
args = list(mean=mean(x),sd=sd(x)))
The two distributions overlap over an area and I would like to draw vertical
lines to demark the lower tail of the distribution which has a higher
median, and the right tail of the distribution with lower median.
You can compute these quantities beforehand and add them using
panel.abline (inside your panel function). It's not entirely
impossible to do it in a single histogram call, but that won't look
pretty.
Deepayan
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