--- loncom/html/adm/help/tex/Statistics_Overall_Key.tex 2004/05/10 13:59:40 1.2
+++ loncom/html/adm/help/tex/Statistics_Overall_Key.tex 2005/01/10 18:01:30 1.5
@@ -5,37 +5,59 @@ data about the problems currently in the
\begin{itemize}
-\item \textbf{#Stdnts}
+\item \textbf{\#Stdnts}
+
Total number of students attempting the problem.
\item \textbf{Tries}
+
Total number of attempts to solve the problem.
\item \textbf{Max Tries}
-Largest number of to solve the problem by a student.
+
+Largest number of attempts to solve the problem by a student.
\item \textbf{Mean Tries}
-Average number of tries.
+
+Average number of attempts.
\item \textbf{S.D. tries}
+
Standard Deviation of the tries.
\item \textbf{Skew Tries}
+
Skewness of the students tries.
-\[\frac{\sqrt{ \sum{(Xi - Mean)^3} / #Stdnts}}{\sigma^3}\]
+\[\frac{\sqrt{ \sum{(Xi - Mean)^3} / \#Stdnts}}{\sigma^3}\]
-\item \textbf{DoDiff}
-Degree of Difficulty of the problem.
-\[ 1 - \frac{\#YES+\#yes}{Tries} \]
+\item \textbf{\#YES}
-\item \textbf{#YES}
Number of students who solved the problem correctly.
-\item \textbf{#yes}
+\item \textbf{\#yes}
+
Number of students who solved the problem by override.
\item \textbf{\%Wrng}
+
Percentage of students who tried to solve the problem but were unable to.
+\item \textbf{DoDiff}
+
+Degree of Difficulty of the problem.
+\[ 1 - \frac{\#YES+\#yes}{Tries} \]
+
+\item \textbf{DoDisc}
+
+Degree of Discrimination of the problem.
+
+The students are grouped based on their scores on the sequence which
+contains the homework problem. The percent score of the bottom 25\% of
+the students is subtracted from the percent score the to top 25\% of
+the students. This yields a number from -1 to 1. 1.0 indicates
+all of the good students answered the problem correctly and none of the
+poor students answered it correctly. Conversely, a score of -1.0 indicates
+all of the good students got the problem wrong and the bad students did
+well.
\end{itemize}