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Help file for Lertap 5
6.4.3.1.3 The bands
Three sections of data are found at the end of a Statsf report.
The bands simply summarize item difficulty and discrimination figures.
In this example, most items had difficulty values (proportion correct) lying between
0.40 and 0.60. Four items had difficulties above 0.60 but less than 0.70. One item, Q5,
had a difficulty greater than 0.70, while another, Q22, had difficulty less than 0.10.
Item discrimination values are interpreted in the same manner. For this test, only five
items (Q4, Q22, Q5, Q14, and Q24) had discrimination values below 0.40.
Item discrimination figures may be negative. When this happens such items will appear
in the .00 band.
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