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Annotation of loncom/html/adm/help/tex/Statistics_Overall_Key.tex, revision 1.5

1.1       matthew     1: \label{Statistics_Key}
                      2: 
1.2       www         3: The \textbf{Overall Problem Statistics} page displays the following 
1.1       matthew     4: data about the problems currently in the course:
                      5: 
                      6: \begin{itemize}
                      7: 
1.4       albertel    8: \item \textbf{\#Stdnts}
1.3       matthew     9: 
1.1       matthew    10: Total number of students attempting the problem.
                     11: 
                     12: \item \textbf{Tries}
1.3       matthew    13: 
1.1       matthew    14: Total number of attempts to solve the problem.
                     15: 
                     16: \item \textbf{Max Tries}
1.3       matthew    17: 
1.5     ! vandui11   18: Largest number of attempts to solve the problem by a student.
1.1       matthew    19: 
                     20: \item \textbf{Mean Tries}
1.3       matthew    21: 
1.5     ! vandui11   22: Average number of attempts.
1.1       matthew    23: 
                     24: \item \textbf{S.D. tries}
1.3       matthew    25: 
1.1       matthew    26: Standard Deviation of the tries.
                     27: 
                     28: \item \textbf{Skew Tries}
1.3       matthew    29: 
1.1       matthew    30: Skewness of the students tries.
1.4       albertel   31: \[\frac{\sqrt{ \sum{(Xi - Mean)^3} / \#Stdnts}}{\sigma^3}\]
1.1       matthew    32: 
1.4       albertel   33: \item \textbf{\#YES}
1.1       matthew    34: 
                     35: Number of students who solved the problem correctly.
                     36: 
1.4       albertel   37: \item \textbf{\#yes}
1.3       matthew    38: 
1.1       matthew    39: Number of students who solved the problem by override.
                     40: 
                     41: \item \textbf{\%Wrng}
1.3       matthew    42: 
1.1       matthew    43: Percentage of students who tried to solve the problem but were unable to.
                     44: 
1.3       matthew    45: \item \textbf{DoDiff}
                     46: 
                     47: Degree of Difficulty of the problem.  
                     48: \[ 1 - \frac{\#YES+\#yes}{Tries} \]
                     49: 
                     50: \item \textbf{DoDisc}
                     51: 
                     52: Degree of Discrimination of the problem.
                     53: 
                     54: The students are grouped based on their scores on the sequence which 
                     55: contains the homework problem.  The percent score of the bottom 25\% of
                     56: the students is subtracted from the percent score the to top 25\% of
                     57: the students.  This yields a number from -1 to 1. 1.0 indicates
                     58: all of the good students answered the problem correctly and none of the
                     59: poor students answered it correctly.  Conversely, a score of -1.0 indicates
                     60: all of the good students got the problem wrong and the bad students did
                     61: well.
1.1       matthew    62: 
                     63: \end{itemize}