Choosing which test to pay for, given a fixed budget

Post #4 describes the usual case. This is about the unusual one.

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 took me longer than it should have to see that.

Narrowing post #11, because the general version has more than one answer.

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

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

Adding a source would improve this post and I do not have one to hand.

Post #22 and I disagree about the size of the effect, not about the direction.

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.

This follows post #37 rather than contradicting it.

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

One of those cases where knowing the mechanism does not help the decision.

Sensible. I would want the same detail before I acted on it either.

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

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.