loncom/html/adm/help/tex/Statistics_Overall_Key.tex - diff

Return to Statistics_Overall_Key.tex CVS log

Up to [LON-CAPA] / loncom / html / adm / help / tex

version 1.9, 2007/08/07 21:29:16	version 1.10, 2008/02/22 19:22:21
Line 77 problem parts of the selected students o	Line 77 problem parts of the selected students o

To compute the KR-21 reliability statistic the following formula is used:	To compute the KR-21 reliability statistic the following formula is used:

\[KR-21 = \frac{K}{K-1} \cdot \frac{1-(M \cdot (K-M))}{K \cdot s^{2}}\]	\[KR-21 = \frac{K}{K-1} \cdot \left(1- \frac{M \cdot (K-M)}{K \cdot s^{2}} \right)\]

Where	Where
\begin{description}	\begin{description}