[LON-CAPA-cvs] cvs: loncom /html/adm/help/tex Statistics_Overall_Key.tex

[riegler]

riegler		Fri Feb 22 14:22:22 2008 EDT

  Modified files:              
    /loncom/html/adm/help/tex	Statistics_Overall_Key.tex 
  Log:
  wrong KR-21 formula
  
Index: loncom/html/adm/help/tex/Statistics_Overall_Key.tex
diff -u loncom/html/adm/help/tex/Statistics_Overall_Key.tex:1.9 loncom/html/adm/help/tex/Statistics_Overall_Key.tex:1.10
--- loncom/html/adm/help/tex/Statistics_Overall_Key.tex:1.9	Tue Aug  7 17:29:16 2007
+++ loncom/html/adm/help/tex/Statistics_Overall_Key.tex	Fri Feb 22 14:22:21 2008
@@ -77,7 +77,7 @@
 
 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 
 \begin{description}