Hi,
I have a data set about age from 2006 to 2009 for certain individual. I
would like to draw the kernel density estimation to age for each year. But I
don't know how to draw the different plots in one graph.
The data looks like:
Year ID Age
2006 1 20
2006 2 30
2007 1 21
2007 2 31
2008 1 22
2009 1 23
I first use hist(age) to draw the histogram for age, then use
lines(density(age)) to draw its kernel. But since I need to draw the four
years kernel for age in one graph, I don't need the hist. I also tried the
package lattice of kernelplot, But I still don't know how to draw the four
years kernel in one graph. Also, I don't need the rug(age) in kernelplot,
how can I delete it?
Thanks.
--
Yi Du
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