[R] qqnorm in R-0.63.3

Tino Reinhardt h0444idm at student.hu-berlin.de
Tue Mar 16 02:25:12 CET 1999

Dear List,

invoking qqnorm-plots in Version 63.3 produces funny things:

using the option `type="s"´ on qqnorm should give a nice *line* of
observed quantiles. Now, the line is walking along in order to the
points index instead from lowest to highest, wich makes funny slopes.

try	x <- table(rnorm(1000)	# or similar and
	qqnorm(x,type="s")	# in 0.63.2 and 63.3

Well, the NEWS-file says `qqnorm() uses ppoints() and returns a list
with x sorted along y.´ and, IMHO, that explains the slopes.
But is it generally a bad idea to connect the observed points and
print a nice line instead?

and if not, could anyone explain why it should be x sorted along y?


Tino Reinhardt * tel: ++49 +30 29004033 * tino.reinhardt at rz.hu-berlin.de

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