Assuming "dat" is the name of the data frame, this should get you started:
library(lattice)
histogram(~ unlist(dat[-1]) | factor(rep(c("A1", "A2"), each=nrow(dat))),
panel=function(...) {
panel.histogram(...)
panel.densityplot(...)
}, type="density")
Andy
From: Davendra Sohal
>
> Hi,
>
> I am new to R...a recent convert from SAS.
> I have a dataset that looks like this:
>
> SEQ A1 A2
> A 532.5 554.5
> B 25.5 35.5
> C 265.2 522.2
> D 245.55 521.56
> E 546.52 141.52
> F 243.25 32.56
> G 452.55 635.56
> H 15.14 16.54
> I 543.4 646.56
> J 54.4 654.5
> K 646.5 64.54
> L 645.4 614.46
> M 646.54 634.46
>
> I want to make a histogram each for A1 and A2, with density
> curves, on the same plot so that I can see how they overlap.
>
> Please let me know some simple code for this.
>
> I looked at ldahist but it was complicated. Anything simpler?
>
> Thanks a lot,
> -DS.
>
> [[alternative HTML version deleted]]
>
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>
>
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