Talk:Kuder–Richardson Formula 20

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Formula Explanation[edit]

Yet another article giving a formula without explaining all the variables. Pi and Qi would seem to be the proportion of people getting an item correct or incorrect as described here [[1]] . It might also be helpful to indicate the variance and associated sum of squares are applied to raw scores with N being the number of people in the sample (not number of test items). —Preceding unsigned comment added by 98.231.152.208 (talk) 15:11, 22 October 2010 (UTC)

Also why the name[edit]

Rather unusual name - is there some history behind this? What were KR1 to KR19? — Preceding unsigned comment added by 31.221.13.140 (talk) 09:48, 11 May 2012 (UTC)