[R] hist and truehist
p.dalgaard at biostat.ku.dk
Fri Nov 26 16:48:47 CET 2004
Gregor GORJANC <gregor.gorjanc at bfro.uni-lj.si> writes:
> Up to now I have been using hist() to display the distributions.
> Howevere, I noteiced strange numbers on y (vertical) axis, if I used
> probability = T or freq = F option. I thought it is a bug and launched
> the R-bug system and found some posts on that matter. Brian Ripley
> responded to one, that one should look at truehist() for that. Ok I
> can use truehist() if I want to see the ratios or probabilities, but
> what is then the "density or probability" in hist()?
> truehist(mydata) # looks OK
And truehist(mydata, h=.5)?
It is a density estimate. The sum of the bar _areas_ should be 1.
> sum(x$intensities * .5)
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
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