Needle length selection — anyone have experience?

TrialTracker_MD said:

There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.

DadBodDave said:

That is right for the weekly injectables.

Saving this. It is the first explanation that did not require me to already understand it. I will report back once I have actually tried it.

TrialTracker_MD said:

There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

I read this differently. The confidence in this thread is running ahead of the evidence, and I would rather the uncertainty were stated than smoothed over because it is unsatisfying.

Adding the numbers, since they settle part of this. The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the same conditions. Nobody wants that answer and it is still the answer.

Ask again with the specifics and you will get a better answer than this one.

Moderator note: the sourcing question belongs in the vendor section and has been split out. Report rather than reply if it drifts again.