zehsilva
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My mental model for the difference between the two results is based on the following:
1) the studies by Krebs and Johansen are analysis based on the "National Survey on Drug Use and Health (...), randomly selected to be representative of the adult population in the United States".
2) ACX readers population is not representative of the US population, in fact, it might be skewed in some dimensions that are very relevant here.
3) there are significant differences in the fraction of each sample that report psychedelic use
3.1) in the case of Krebs and Johansen (2013, 2015), it is ~13% reporting lifetime psychedelic use, while in the subsample of ACX readers survey considered in this... (read more)
To avoid such misunderstanding I edited the original comment with "subsample of ACX readers survey considered in this report (...)"