Abstract
A procedure was described by Rogers (1978) for using statistical control charts to display test item analysis data. Rogers' charts in volved plotting individual item difficulty indices with control limits and centerline values derived from an implicitly assumed mean item difficulty of 50%. The author of the present paper contends that a more useful representation of test item characteristics can be ob tained by adopting the usual control charting convention of allow ing the data itself to determine limit and centerline values. Then these values can be compared to any criterion difficulty level(s) deemed appropriate for a given set of test items. Although control charts cannot always be applied to item analysis, the author de scribes two specific situations where they can be used.
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