Choosing which test to pay for, given a fixed budget — does this still hold?

Choosing which test to pay for, given a fixed budget — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below.

A question about how a record should be read rather than about a supplier.

We have results from Janoshik and from PeptideMeter on the same product line, months apart, agreeing closely. My question is what that agreement actually establishes, given that neither saw the other's sample.

I suspect the honest answer is narrower than it feels, and I would like it stated precisely.

Narrowing the opening post, because the general version has more than one answer.

Repeat determination on the same product line months apart is the measurement that speaks to consistency, and consistency is what most buyers actually want.

Posted with less confidence than the sentence structure implies.

A record with four results over sixteen months is a thin record rather than a bad one, and the honest description says which.

I have said this before in a thread nobody could find, so it is worth repeating.

It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured.

Repeat testing: if you want to verify the same lot a second time, testing with a different service strengthens the conclusion. Testing with the same service verifies reproducibility but uses the same method.

The record shows what was measured. Everything beyond that is inference and this site tries to keep the line visible.

Worth separating two things that post #5 runs together.

Repeat determination on the same product line months apart is the measurement that speaks to consistency, and consistency is what most buyers actually want.

A partial answer, offered because a partial answer beats none.

A record with four results over sixteen months is a thin record rather than a bad one, and the honest description says which.

I would want to see it done twice before believing it once.

It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured.

I have deliberately not rounded that, because the rounding is where the argument starts.

A record with four results over sixteen months is a thin record rather than a bad one, and the honest description says which.

Taking post #10 at face value and following it one step further.

Repeat determination on the same product line months apart is the measurement that speaks to consistency, and consistency is what most buyers actually want.

That much is documented. The rest is how I have interpreted it.

Post #8 and I disagree about the size of the effect, not about the direction.

The record shows what was measured. Everything beyond that is inference and this site tries to keep the line visible.

The step people skip is the one I have spelled out.

Repeat testing: if you want to verify the same lot a second time, testing with a different service strengthens the conclusion. Testing with the same service verifies reproducibility but uses the same method.

It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about anything other than what was measured.