--- loncom/html/adm/help/tex/Statistics_Overall_Key.tex 2004/01/28 14:36:49 1.1
+++ loncom/html/adm/help/tex/Statistics_Overall_Key.tex 2004/07/12 19:29:02 1.3
@@ -1,41 +1,63 @@
\label{Statistics_Key}
-The \textbf{Overall Problem Statistics} page displayes the following
+The \textbf{Overall Problem Statistics} page displays the following
data about the problems currently in the course:
\begin{itemize}
\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.
\item \textbf{Mean Tries}
+
Average number of tries.
\item \textbf{S.D. tries}
+
Standard Deviation of the tries.
\item \textbf{Skew Tries}
+
Skewness of the students tries.
\[\frac{\sqrt{ \sum{(Xi - Mean)^3} / #Stdnts}}{\sigma^3}\]
-\item \textbf{DoDiff}
-Degree of Difficulty of the problem.
-\[ 1 - \frac{\#YES+\#yes}{Tries} \]
-
\item \textbf{#YES}
+
Number of students who solved the problem correctly.
\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}