Is there a method for determining the minimal sample size for a Blamd Altman plot?
Not sure if you have received any feedback elsewhere, but here are some resources for you:
Martin Bland, within his overall documentation for the B-A methodology, has a FAQ on sample size here:
However, there are some limitations in the approach mentioned there that have been referenced, for example, here:
As a result of the above paper, at least in part, there is an R package available called blandPower, with some documentation here:
That package does not appear on CRAN, so would need to be installed directly from GitHub as described there.