[R] problems with SPC charts in R

[vikrant]

Dear Bart,
According to your suggestion I wrote to maintainer of the package and the
reply which I  got is as follows:-

"You shouldn't use R charts for  
monitoring dispersion using sample sizes larger than 20, and for  
sample sizes greater than 25 you get an error. From theory, R chart  
used the distribution of relative range for estimating sigma, which is  
tabulated up to a sample size of 25 "

So R charts should not be used in case the group sample size is greater than
25.


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