Wasserstein 2016 The American Statistician

Wasserstein RL, Lazar NA (2016) The ASA's statement on p-values: context, process, and purpose. The American Statistician 70:129-33.

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Wasserstein RL, Lazar NA (2016) The American Statistician

Abstract: In February, 2014, George Cobb, Professor Emeritus of Mathematics and Statistics at Mount Holyoke College, posed these questions to an ASA discussion forum: Q: Why do so many colleges and grad schools teach p = .05? A: Because that's still what the scientific community and journal editors use. Q: Why do so many people still use p = 0.05? A: Because that's what they were taught in college or grad school. Cobb’s concern was a long-worrisome circularity in the sociology of science based on the use of bright lines such as P < 0.05 : “We teach it because it’s what we do; we do it because it’s what we teach.” This concern was brought to the attention of the ASA Board.

The ASA Board was also stimulated by highly visible discussions over the last few years. For example, ScienceNews (Siegfried, 2010) wrote: “It’s science’s dirtiest secret: The ‘scientific method’ of testing hypotheses by statistical analysis stands on a flimsy foundation.” A November, 2013, article in Phys.org Science News Wire (2013) cited “numerous deep flaws” in null hypothesis significance testing. A ScienceNews article (Siegfried, 2014) on February 7, 2014, said “statistical techniques for testing hypotheses…have more flaws than Facebook’s privacy policies.” A week later, statistician and “Simply Statistics” blogger Jeff Leek responded. “The problem is not that people use P-values poorly,” Leek wrote, “it is that the vast majority of data analysis is not performed by people properly trained to perform data analysis” (Leek, 2014). ...

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