PDROPEXTREME= drop persons with extreme scores = No |
Unanchored persons with extreme (zero, minimum possible or perfect, maximum possible) scores provide no information for estimating item measures, but they are reported and included in summary statistics. To remove them:
PDROPEXTREME = No ; do not drop extreme persons (standard)
PDROPEXTREME = Yes or All ; drop zero (minimum possible) and perfect (maximum possible) scores
PDROPEXTREME = Zero or Low or Bottom or Minimum ; drop zero or minimum-possible scores
PDROPEXTREME = Perfect or High or Top or Maximum ; drop perfect or maximum-possible scores
Example 1: The data file contains many data records of persons who did not attempt this test and so were scored 0. They are skewing the test statistics:
PDROPEXTREME = Zero
Example 2: On a satisfaction survey, hurried respondents mindlessly code every item "highly satisfied".
PDROPEXTREME = Perfect
Help for Winsteps Rasch Measurement and Rasch Analysis Software: www.winsteps.com. Author: John Michael Linacre
Facets Rasch measurement software.
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Freeware student/evaluation Minifac download Winsteps Rasch measurement software. Buy for $149. & site licenses. Freeware student/evaluation Ministep download |
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Forum: | Rasch Measurement Forum to discuss any Rasch-related topic |
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Questions, Suggestions? Want to update Winsteps or Facets? Please email Mike Linacre, author of Winsteps mike@winsteps.com |
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