![]() ![]() It is tough to pin down how widespread the problem is, but Simonsohn has the sense that it is serious. P-hacking is especially likely, he says, in today’s environment of studies that chase small effects hidden in noisy data. ![]() Simonsohn’s simulations have shown9 that changes in a few data-analysis decisions can increase the false-positive rate in a single study to 60%. ![]() Such practices have the effect of turning discoveries from exploratory studies - which should be treated with scepticism - into what look like sound confirmations but vanish on replication. 05”, and “She is a p-hacker, she always monitors data while it is being collected.” It may be the first statistical term to rate a definition in the online Urban Dictionary, where the usage examples are telling: “That finding seems to have been obtained through p-hacking, the authors dropped one of the conditions so that the overall p-value would be less than. “P-hacking,” says Simonsohn, “is trying multiple things until you get the desired result” - even unconsciously. Perhaps the worst fallacy is the kind of self-deception for which psychologist Uri Simonsohn of the University of Pennsylvania and his colleagues have popularized the term P-hacking it is also known as data-dredging, snooping, fishing, significance-chasing and double-dipping. Hid original idea of p-values (a measure of whether an observed result can be attributed to chance) was reasonable enough, but over time the dead hand got hold of it: Many will remember Ronald Fisher (1890–1962) as the early twentieth century Darwinian who reconciled Darwinism with Mendelian genetics, hailed by Richard Dawkins as the greatest biologist since Darwin. Share Facebook Twitter LinkedIn Flipboard Print arroba Email Ronald Fisher/Bletchleyįurther to “Everyone seems to know now that there’s a problem in science research today and “At a British Journal of Medicine blog, a former editor says, medical research is still a scandal,” Ronald Fisher’s p-value measure, a staple of research, is coming under serious scrutiny. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |