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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Oct 21 - 22 2024, Mon.-Tues. | In person workshop: Facets and Winsteps in expert judgement test validity - UNAM (México) y Universidad Católica de Colombia. capardo@ucatolica.edu.co, benildegar@gmail.com |
Oct. 4 - Nov. 8, 2024, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
Jan. 17 - Feb. 21, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
May 16 - June 20, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
June 20 - July 18, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Further Topics (E. Smith, Facets), www.statistics.com |
Oct. 3 - Nov. 7, 2025, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
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