Book page updated
I've updated the page of supplemental information for the Understanding and Using Statistics in Psychology page. You can see it here, but it's not much use if you haven't got the book.
A blog about learning statistics in psychology, health and social sciences.
1 Comments:
Dear prof Miles,
Today I browsed through your book Understanding and using stats in psy, feeling this to be a nice and sound intro for e.g. students of psychology. In doing so, I hit upon
two pages that may need amending (see below). I hope this comment is of use to you.
Sincerely,
Gerard van Breukelen
assoc prof Statistics at Maastricht University, NL
page 284 box:
alpha and not alpha**2 gives the proportion true variance (see e.g. Van Breukelen, The Statistician, 1997, p. 444-447 and its reference to Lord and Novick, 1968).
page 311 post-hoc power analysis:
If based on the effect size in the sample (as SPSS does), this is useless, giving an estimated power less than 50% for non-significant effects by definition.
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