DebRD_ATL said:

The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.

Coming at DebRD_ATL’s question from a different direction. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.

Happy to go further on any of that.

The figures, for anyone assembling their own picture. One habit that pays for itself: post the method alongside the number. A figure without its method cannot be checked, and an unchecked figure is how this community accumulates folklore.

Following on from DebRD_ATL — and this may be the naive question:

Was that from a primary source or from a summary of one?

jason_paloalto said:

One habit that pays for itself: post the method alongside the number.

Pushing back on jason_paloalto here. I would resist the confidence. Half of what this board was certain about two years ago has since been quietly dropped, and nobody went back to correct the threads.

jason_paloalto said:

One habit that pays for itself: post the method alongside the number.

Right, and the exception is worth naming rather than left implied, because the exception is where people get into trouble.