Table 12 Bias Summary Report |
This is for 32-bit Facets 3.87. Here is Help for 64-bit Facets 4
Zscore=, Bias= and Xtreme= control Table 12. One table is produced for each bias estimation. Each entry in the table is a bar-chart showing the distribution of reported statistics. The scale is from left to right. "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.
Table 12 reports the same statistics reported numerically in the later Table 13. So, -4, -3 etc are the numerical values of those statistics (compare with the numerical Table 13). M is the mean, S is one standard deviation away, Q is two standard deviations away.
Bias/Interaction Size = Bias Size (usually in logits) in Table 13
Bias/Interaction Significance = t-value in Table 13
Example:
The numbers are frequencies. They are printed vertically. The biggest number for "Bias/Interaction size" is 107. 107 interactions are about 0.1 logits in size. 115 interactions have a bias/interaction significance (t) of about -0.3
The frequencies summarize the full Table of interactions (Table 14) and are useful for seeing the distributional pattern.
In these pictures there are clearly a few outliers needing special attention, but the great majority of interactions are statistically and substantively close to 0.
Help for Facets Rasch Measurement and Rasch Analysis Software: www.winsteps.com Author: John Michael Linacre.
Facets Rasch measurement software.
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