Accessing Control Chart constants/unbiasing constant
I'm doing a variance analysis and need to look at the unbiased variance estimates for a number of subgroups I'm looking at. I can manually calculate them using a d2 table I have, but I was hoping there was a way to put that into a formula. I know that it can be derived from the Chi-squared distribution, but I don't have the math for that. Any help on either a direct way to extract d2, or th...