DIF/DPF/DTF Scatterplots of paired measures - Table

The DIF/DPF item measure pairs in Table 30.1, 31.1, are scatterplotted. The confidence bands and empirical slope (correlation) are also shown. The diagonal line is a joint trend line. The curve lines are smoothed 95% confidence intervals.

 

 

DTF changes the spread (range) of the person measures in the two groups.

 

1. Analyze the two groups separately.

2. Output the TCCFILE= from the two analyses

3. Scatterplot the two sets of measures for the scores.

4. The scatterplot will show you how DTF changes the measure for each score.

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