We’ve considered the brief and full statistics sheets for the first subtest, respectively (and respectfully) known as Stats1b and Stats1f.  For years Lertap versions provided only the full statistics; the brief statistics sheet was added in Lertap 5 to make it possible to get a quick idea of how items performed.


These two sheets, the full and brief ones, use point-biserial correlation coefficients to index item discrimination.  There’s another way of indicating how well an item discriminates between the strong and the weak—separate test results into groups, one with the strongest performers, one with the weakest, and, maybe, the group in-between—and then look at item-level results in each group.


Now, our Cook's Tour of Lertap has been around for a fair number of years. Lertap has changed since the Cook's Tour first emerged.


One of the largest changes has to do with the Stats1ul report. An example of the current Stats1ul report is seen back at the MathsQuiz topic, and we recommend it (would you expect us not to?). Once you're into the MathsQuiz example, you'll also get to learn about the csem1 report made by Lertap.


Affective item reports are next.