CHISQUARE= in IFILE= and PFILE= |
In IFILE= and PFILE=, report Infit and Outfit fit statistics as |
|
CHISQUARE=No |
Mean-square fit statistics = Chi-square statistics divided by their degrees of freedom. |
CHISQUARE=Yes |
Chi-square fit statistics |
The chi-square degrees of freedom are reported in IFILE=, PFILE= columns INDF and OUTDF. The two-sided chi-square probabilities are reported adjacent to the chi-squares when LOCAL=Prob |
Computation: Winsteps and Facets usually report mean-square statistics. These are chi-squares divided by their degrees of freedom. Now the chi-squares and their d.f. are also reported. For the computation of the mean-squares and d.f., see www.rasch.org/rmt/rmt34e.htm together with www.rasch.org/rmt/rmt162g.htm
So that qi2 = 2 / d.f.
And chi-square = mean-square * d.f.
Example:
LOCAL=Prob
CHISQUARE=Yes
IFILE=if.txt
Then, in file: if.txt:
Infit Chi-square is 6.77 with 7.52 d.f., 2-sided probability = .9809
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