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Diff for /loncom/html/adm/help/tex/Statistics_Overall_Key.tex between versions 1.2 and 1.3

version 1.2, 2004/05/10 13:59:40 version 1.3, 2004/07/12 19:29:02
Line 6  data about the problems currently in the Line 6  data about the problems currently in the
 \begin{itemize}  \begin{itemize}
   
 \item \textbf{#Stdnts}  \item \textbf{#Stdnts}
   
 Total number of students attempting the problem.  Total number of students attempting the problem.
   
 \item \textbf{Tries}  \item \textbf{Tries}
   
 Total number of attempts to solve the problem.  Total number of attempts to solve the problem.
   
 \item \textbf{Max Tries}  \item \textbf{Max Tries}
   
 Largest number of to solve the problem by a student.  Largest number of to solve the problem by a student.
   
 \item \textbf{Mean Tries}  \item \textbf{Mean Tries}
   
 Average number of tries.  Average number of tries.
   
 \item \textbf{S.D. tries}  \item \textbf{S.D. tries}
   
 Standard Deviation of the tries.  Standard Deviation of the tries.
   
 \item \textbf{Skew Tries}  \item \textbf{Skew Tries}
   
 Skewness of the students 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.  Number of students who solved the problem correctly.
   
 \item \textbf{#yes}  \item \textbf{#yes}
   
 Number of students who solved the problem by override.  Number of students who solved the problem by override.
   
 \item \textbf{\%Wrng}  \item \textbf{\%Wrng}
   
 Percentage of students who tried to solve the problem but were unable to.  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}  \end{itemize}
Removed from v.1.2  
changed lines
  Added in v.1.3

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