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2007 Feb 08
1
the plotting position of theoretical quantile for qqnorm
...llo,
I have a doubt about the plotting position of the theoretical quantile for
the qqnorm
command in R.
Let F be the theoretical distribution of Y, we observed a sample of size n,
y1,y2, ...,
yn. We then sort it and comspare these empirical quantiles to the expected
ones
from F. For the plotting poition, there are several options:
1. i/(n+1)
2. (i-.375)/(n+.25)
3. (i- .3175)/ (n + .365)
etc.
Which one is "qqnorm" used?
Thx a lot!
Liz
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