Behavioral and Brain Sciences

Open Peer Commentary
Chow: Statistical significance

The Ego has landed! The .05 level of statistical significance is soft (Fisher) rather than hard (Neyman/Pearson)

Lester E. Krueger a1
a1 Department of Psychology, Ohio State University, Columbus, OH 43210-1222 [email protected]


Chow pays lip service (but not much more!) to Type I errors and thus opts for a hard (all-or-none) .05 level of significance (Superego of Neyman/Pearson theory; Gigerenzer 1993). Most working scientists disregard Type I errors and thus utilize a soft .05 level (Ego of Fisher; Gigerenzer 1993), which lets them report gradations of significance (e.g., p < .001).