Hello,

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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