Re: sample size and sig levels

["Rick Barth" <rbarth@xxxxxxxxxxxxx>]

Bill:  Yes, additional information is needed to determine the meaningfulness of
statistical tests.  Effect sizes should be provided to indicate the relative
meaning of the change or difference--these are not sensitive to sample size.

Rick

Richard P. Barth, Ph.D.
Frank A Daniels Professor and
Chair of the Doctoral Program
School of Social Work
301 Pittsboro Rd
University of North Carolina
Chapel Hill, NC  27599-3550
(v) 919 962 6516
(f)        962 1486

-- Begin original message --

From: bill higgins <bill_higginsus@xxxxxxxxx>
Date: Thu, 8 May 2003 14:54:55 -0700 (PDT)
Subject: sample size and sig levels
To: Child Maltreatment Researchers   <CHILD-MALTREATMENT-RESEARCH-L@xxxxxxxxxxx>
Reply-To: CHILD-MALTREATMENT-RESEARCH-L@xxxxxxxxxxx

I recently read an article that had an extremely large
sample (population study of health care).  The
differences looked small but were statistically
significant.  should there be adjustments made for
extremely large samples?

bill


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