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Date:         Tue, 27 Apr 1999 08:22:18 -0400
Reply-To:     William Dudley <wdudley@SPH.EMORY.EDU>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         William Dudley <wdudley@SPH.EMORY.EDU>
Subject:      Re: reliability for a knowledge scale
Content-Type: text/plain; charset="us-ascii"

At 11:50 AM 4/23/1999 +1000, Simon Moss wrote: >Karen Scheltema wrote: > >> A physician I work with has a knowledge scale that he developed. It >> is a series of 12 questions. Some are True/False; others are multiple >> choice. The 12 questions were coded as correct/incorrect, and then a >> percent correct for the entire 12 items was calculated. I know there >> are problems with that given the different number of response items, >> but this seemed like the best solution, given that the data had >> already been collected. A reviewer for a journal wants evidence of >> reliability. When I ran Kuder-Richardson on the correct/incorrect >> responses, the alpha was .3. I seem to recall something about it not >> being necessarily desirable for knowledge scales, in particular, to >> have internal consistency because the concepts being measured are >> independent of each other. What justification is there for having a >> knowledge scale with low internal consistency? It seems overkill to >> report the 12 items separately. Any and all thoughts appreciated. >> >> Karen Scheltema, MA, MS >> Statistician >> North Memorial Health Care >> 3300 Oakdale Ave N >> Robbinsdale, MN 55422 >> (612) 520-2744 (612) 520-4686 (fax) >> mailto: > You might want to look at the paper by Bollen and Lennox regarding the logic of internal consistancy for such scales. This may provide you with some food for thought.

Bollen, K. , Lennox, R (1991) Conventional wisdom on measurement: A structural equation perspective. Psychological Bulletin. 110(2) 305-314.

*************************************************** * William N. Dudley, PhD * * Behavioral Science and Health Education * * Rollins School of Public Health * * Emory University * * Atlanta 30322 * * Phone 404 727 2447 * * FAX 404 727 1369 * ***************************************************

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