A better plot may result from copying Facets graph coordinates, see "Copy Plot Data to Clipboard".
From the Output Files menu, "Graph output file" provides the values plotted in Table 8 for the probability curves and expected score ogive. Also produced by Graphfile=.
The output is is in fixed column format, or iIf comma-separated values are preferred, specify "filename, CSV" or CSV=Y. For Tab-separated values, specify "filename, Tab" or CSV=Tab
Heading lines= controls display of heading lines. QM quotation marks, controls whether labels are withing quotation marks.
Modify Specifications provides further options
The fixed column format is:
Field |
Columns |
Contents |
1 |
1-10 |
Scale number (matches Sub-Table number for Table 8) |
2 |
11-20 |
Measure (X-Axis) |
3 |
21-30 |
Expected Score |
4 |
31-40 |
Category value corresponding to expected score |
5 |
41-50 |
Probability for bottom category |
6 |
51-60 |
Probability for second category |
7 ... |
61-70, ... |
Probabilities for higher categories |
Scale Measure Expected ExpCat Prob:0 Prob:1 Prob:2
1 -3.00 .10 0 .90 .10 .00
1 -2.91 .11 0 .89 .11 .00
1 -2.82 .12 0 .88 .11 .00
Example:Provide coordinates so I can plot beautiful probability curves using my graphics package:
Graphfile=plot.dat,CSV; the name of an output file with comma-separated values, produces, for a 3 category rating scale (or partial credit):
1,-2.00,.23,0,.79,.20,.01
1,-1.92,.24,0,.77,.21,.02
1,-1.85,.26,0,.76,.22,.02