Data compression |
To lessen the size of its data file, Facets permits two types of compression in its data format:
A. Observations in sequence. Observations are often ordered by element sequence number on one facet, e.g., item number, without alteration to the other facets, e.g., examinee number and judge number. Such observations can be recorded as a range, e.g.,
12,1,3,101,4 ; person 12 on item 1 by judge 101 is rated a "4"
12,2,3,101,3 ; person 12 on item 2 by judge 101 is rated a "3"
12,3,3,101,5 ; person 12 on item 3 by judge 101 is rated a "5"
; item 4 not observed here
12,5,3,101,2 ; person 12 on item 5 by judge 101 is rated a "2"
can be entered in the Facets data file with a range of element numbers on only one facet:
12,1-5,101,4,3,5,,2 ; person 12 on items 1-5 by judge 101,
rated "4","3","5",Missing here,"2"
B. Identical replications. In survey analysis, many identical replications may appear, e.g.,
2,7,2 ; a respondent in ethnic group "2" and age group "7" responded 2
2,7,2 ; another in ethnic group "2" and age group "7" responded 2
2,7,2 ; a 33rd person in ethnic group "2" and age group "7" responded 2
can be entered in the Facets data file as
R33,2,7,2 ; 33 respondents in ethnic group "2" and age group "7" responded 2
C. Identical replications observed in sequence. An element number range and a replication count can be used simultaneously:
R33,2,7,4-6,2,3,1 ; 33 respondents in ethnic group "2" and age group "7" answered items 4,5,6 with "2", "3", "1"
Help for Facform Rasch Measurement Software: www.winsteps.com. Author: John Michael Linacre
Facets Rasch measurement software.
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Coming Rasch-related Events | |
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May 17 - June 21, 2024, Fri.-Fri. | On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com |
June 12 - 14, 2024, Wed.-Fri. | 1st Scandinavian Applied Measurement Conference, Kristianstad University, Kristianstad, Sweden http://www.hkr.se/samc2024 |
June 21 - July 19, 2024, Fri.-Fri. | On-line workshop: Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com |
Aug. 5 - Aug. 6, 2024, Fri.-Fri. | 2024 Inaugural Conference of the Society for the Study of Measurement (Berkeley, CA), Call for Proposals |
Aug. 9 - Sept. 6, 2024, Fri.-Fri. | On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.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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