G
I would be interested to know if there is an alternative estimator for sigma than Rbar/d2 that can be used for sampling. I realize that S^2 is an unbiased estimator for sigma^2, but S is not unbiased for sigma. Is there any option other than Rbar/d2? I am writing a small program for HP calculators and would like it if the only input required was the string of Xbar values. Any help would be appreciated.
------------------
------------------