After a study showed the R-Index for studies cited in Chapter 4 of Kahneman’s book “Thinking Fast and Slow” was only 14, the Nobel laureate himself recognized his conclusions on “priming” were supported by underpowered studies. He also acknowledged that…
there is a special irony in my mistake because the first paper that Amos Tversky and I published was about the belief in the “law of small numbers,” which allows researchers to trust the results of underpowered studies with unreasonably small samples. […] Our article was written in 1969 and published in 1971, but I failed to internalize its message.