Drawing from a multi-dose vial — anyone have experience?

Dr.SleepRoch said:

It is worth asking what the claim would look like if it were false.

Coming at Dr.SleepRoch’s question from a different direction. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.

One concrete data point for the thread. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

One thing that is still open after Dr.SleepRoch’s answer:

What did you change at the same time, and can you separate the two now?

hank_denver said:

Practical: whatever you change, write down the date and the reason.

This is where I part company with the consensus forming above. I think the framing smuggles in the conclusion. Ask it the other way round and the obvious answer reverses, which usually means the question is doing the work.

hank_denver said:

Practical: whatever you change, write down the date and the reason.

Agreed, with the usual condition: that holds for the average and this board is a collection of individuals. A population claim and a personal prediction are different things and get quoted interchangeably.

I would rather be corrected than agreed with, if it comes to it.