Dear Allstaters
A non-job seeking query: I am writing a paper reporting the development of
a scale for use with mental health service users. I want to report the
internal consistency of the scale as satisfactory. One paper recommends
that the internal consistency should be at least 0.60 for a self-report
instrument to be reliable (Mykletun, Stordal and Dahl, BJP, 2001, 540-544)
and at least 0.80 when used as a screening instrument (Nunnally JC and
Bernstein IH [1994] Psychometric Theory, 3rd Ed. New York: McGraw-Hill).
Question: is there an equivalent standard threshold for a
researcher-administered questionnaire? If so, can anyone provide a
reference?
Thanks in advance.
Richard
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Richard A. Powell BA MA MSc
Acting Senior Researcher
Mental Health Services Research and Policy Section
Sainsbury Centre for Mental Health
www.scmh.org.uk
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