On Jul 19, 2010, at 9:57 PM, Farley, Robert wrote:
I'm plotting some trip length frequencies using the following code:
plot( density(zTestData$Distance, weights=zTestData$Actual),
xlim=c(0,10),
main="Test TLFD",
xlab="Distance",
col=6 )
lines(density(zTestData$Distance, weights=zTestData$FlatWeight),
col=2)
lines(density(zTestData$Distance, weights=zTestData$BrdWeight ),
col=3)
which works fine except the distances are all positive, but the
densities don't drop to 0 until around -2 or -3.
Is there a way for me to "force" the density plot to 0 at 0?
Yes. (Assuming it can be zero, given the data.)
Read the help page for density more carefully. Especially the bw and
from arguments.
--
David.
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