This is for 32-bit Facets 3.87. Here is Help for 64-bit Facets 4
Comparing groups of elements: It always helps in these situations to consider the equivalent situation in physical measurement. If Group B were boys and Group G were girls, and you were measuring their heights, how would you compare them?
You would get a height measure for every boy, and a height measure for every girl and then do the standard comparisons of means and standard deviations. This would be easiest for your audience to understand. So let's do the same thing with the Rasch measures.
Use group number "1" in the person labels of all boys, and group number "2" in the person labels of all girls.
Facets will then give a report by group for the person facet. Here it is for the "kct.txt" example.
The standard error of the mean = Population S.D. / √(Count-1)
The "Model S.E." in the Mean rows is the average of the Model S.E.s for the sample, not the S.E. of the Mean Measure.
So the significance of (Boys-Girls) is t = (Boy mean - Girl mean) / √(S.E. (mean Boys)² + S.E. (mean Girls)²) = (1.42 - 1.80) / √( 2.50²/(17-1) + 1.91²/(18-1)) = -0.49 which is not significant with about 32 d.f.
Help for Facets Rasch Measurement and Rasch Analysis Software: www.winsteps.com Author: John Michael Linacre.
Facets Rasch measurement software.
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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 |
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Aug. 5 - Aug. 7, 2024, Mon.-Wed. | 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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