[IPAC-List] Brief description of type 3 and type 4 errors in hypotheis testing.

Joel Wiesen jwiesen at appliedpersonnelresearch.com
Sun Feb 9 10:24:16 EST 2014



"A type III error occurs when the statistician offers the correct
statistical advice for the wrong research question."

"...type IV errors: when a statistician performs the correct analysis
that answers the right research questions when a simpler analysis would
suffice. Why is a type IV error something to worry about? If the
statistics are correct, isn’t our job done? The issue is that when
statisticians commit type IV errors, we are potentially alienating the
client from the collaborative relationship and giving them results they
cannot use."

Joel P. Wiesen, Ph.D., Director
Applied Personnel Research
62 Candlewood Road
Scarsdale, NY 10583-6040
(617) 244-8859

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