[R] Looking for the name of a certain kind of quantile plot
Carl Witthoft
carl at witthoft.com
Wed Apr 4 00:06:18 CEST 2012
Hi,
While playing with quantile-quantile plots, I wrote up some code which
plots something strangely different. Here's the pseudocode:
testhist <- hist(sample_data)
refhist <- hist(rnorm(n, mean=0,sd=1)) # for some large-ish n
cumtest <- cumsum(testhist)
cumref <- cumsum(refhist)
plot(cumref,cumtest)
This produces a straight line of slope 1 for a sample with the same
parameters as the reference sample, and produces S-curves for samples
with different sigmas. A sample with nonzero mean looks almost
exponential (or logarithmic, depending on the sign of the mean).
So my question is: is there a name for this sort of plot, and is it of
any real use in statistical analysis?
thanks.
Carl
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