SE of ∆ [General Sta­tis­tics]

posted by d_labes  – Berlin, Germany, 2020-10-04 10:23 (253 d 19:11 ago) – Posting: # 21969
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Dear Helmut,

» » BTW: the formula (2) is not the error term in the 2×2×2 crossover.
»
» How would you call it?

See the subject of your post.
The error term in the 2×2×2 crossover is MSE (aka mean squared error). Or the square root of MSE.

» We use \((3)\) in PowerTOST’s BE_CI.R line 30:

sqrt(mse*ades$bkni*nc)

where for design = "2x2" ades$bkni is 0.5 and nc is sum(1/n[1]+1/n[2]).
» If we agree that \(\small{\widehat{\sigma}_\textrm{w}=\sqrt{MSE}}\) * we end up with \((2)\)

Correct.

Regards,

Detlew

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