Hi Mark, Thank you for this tool. I am using JMP 13.1.0 and have encountered a few issues with the add-in. 1) The calculated sample size appears to be capped at NMT 302. 2) I found a table online to check the tool against, and I was getting different values for sample size at low power level. For example at alpha=.01, std1=1.0, std2=0.7, power=0.1, Lower One-Sided, the add-in gives me a sample size of 26. But when I calculate this by hand, I get a sample size of 24. var1/var2 = 1.0^2/0.7^2 = 2.0408 F^-1 of .99 with df of 11 and 11 (assuming total N=24) is .2241 F of (2.0408 * .2241) with same dfs is .8949 Power would be .1051 Did I make a mistake? Is your tool using a different formula?

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