[LONCAPAcvs] cvs: loncom /html/adm/help/tex Statistics_Overall_Key.tex
matthew
loncapacvs@mail.loncapa.org
Mon, 12 Jul 2004 19:29:02 0000
matthew Mon Jul 12 15:29:02 2004 EDT
Modified files:
/loncom/html/adm/help/tex Statistics_Overall_Key.tex
Log:
Added help on degree of discrimination.
Index: loncom/html/adm/help/tex/Statistics_Overall_Key.tex
diff u loncom/html/adm/help/tex/Statistics_Overall_Key.tex:1.2 loncom/html/adm/help/tex/Statistics_Overall_Key.tex:1.3
 loncom/html/adm/help/tex/Statistics_Overall_Key.tex:1.2 Mon May 10 09:59:40 2004
+++ loncom/html/adm/help/tex/Statistics_Overall_Key.tex Mon Jul 12 15:29:02 2004
@@ 6,36 +6,58 @@
\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}