[R] Probability plotting with R

Duncan Murdoch dmurdoch at pair.com
Sat Jul 19 01:33:34 CEST 2003

On Fri, 18 Jul 2003 08:50:01 -0700 (PDT), you wrote:

>On Fri, 18 Jul 2003, A. Gunes Koru wrote:
>> Hello,
>> Our professor asked us to do probability plotting using weibull paper,
>> exponential paper, normal, log-normal paper, etc. I know I can create Q-Q
>> plot for normal dist. and see if all te points are on one line. How do I
>> go about other distributions?
>The qqmath() function in the lattice package can do plots like those from
>qqnorm() for other distributions.

Also qqplot used with ppoints, e.g.

# make up some fake data
x <- rexp(100,10)

# calculate standard quantiles to plot against
stdexponential <- qexp(ppoints(100))

# do the plot

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