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Table 6.2 Graphical description of facet statistics |
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One table is produced for each facet. Each entry in the table is a bar-chart reflecting the distribution of the reported statistics. The scale is from left to right, with range such that all facets have the same scale for each statistic. "M" represents the mean value of the statistic for the facet, "S" is one sample standard deviation each side of the mean, "Q" is two sample standard deviations, and "X" is three.
Frequencies above 9 are reported vertically, thus 10 is printed as
1
0
Table 6.2 Junior Scientists Facet Summary.
Logit:
1 1 1 1 1 1 1
+---Q---------S----------M----------S---------Q---+
-1 0 1
Measures and standard errors for elements with extreme scores are omitted from the bar-charts.
Infit MnSq:
1 1 1 1 1 1 1
+----------S------------M+-----------S------------Q
0 1 2
Outfit MnSq:
1 1 1 1 1 1 1
+-----------S------------M------------S-----------+
0 1 2
Infit Zstd:
1 1 1 1 1 1 1
+--Q------+---------S---------+-----M---+---------+-S-------+--------Q+
-4 -3 -2 -1 0 1 2 3
Outfit Zstd:
1 1 1 1 1 1 1
+---Q-----+---------S---------+------M--+---------+--S------+---------Q
-4 -3 -2 -1 0 1 2 3
Definitions of numeric bar-charts: |
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Logit: |
Logit measures of elements |
Infit MnSq: |
Infit, information-weighted, inlier pattern sensitive, mean-square fit statistics |
Outfit MnSq: |
Outfit, outlier sensitive, mean-square fit statistics |
Infit Zstd: |
Standardized, approximately N(0,1), infit statistic |
Outfit Zstd: |
Standardized, approximately N(0,1), outfit statistic |
Help for Facets Rasch Measurement Software: www.winsteps.com.