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gwern comments on Open thread, Jan. 09 - Jan. 15, 2017 - Less Wrong Discussion

3 Post author: MrMind 09 January 2017 08:33AM

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Comment author: gwern 11 January 2017 04:47:33PM 7 points [-]

Time-reversal heuristic: if the failed replication had come first, why would you privilege the original over that? If the replications cannot be trusted, despite the benefit of clear hypotheses to test and almost always higher power & incorporation of heterogeneity, a fortiori, the original cannot be trusted either...

Comment author: John_Maxwell_IV 15 January 2017 12:11:06AM 2 points [-]

It would be surprising if the necessary level of power & incorporation of heterogeneity always happened to fall right in between that of the original study and the replication. I would expect that in many cases, the necessary level is above that of both studies, which means neither can be considered definitive.