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reworded, changing from passivve to active voice, added commas, fixed a few typos.CVS: ----------------------------------------------------------------------

    1: \label{Statistics_Cache}
    2: 
    3: The \textbf{\index{Statistics Cache}Statistics Cache} manages the data 
    4: used in computing student performance statistics.
    5: 
    6: Much of the time spent computing statistics is actually used to
    7: compile student data into a more useful format; the temporary course
    8: cache.  Normally student data is maintained in an archived format,
    9: which does not provide for rapid access.  Since each student's data is
   10: stored on their home server in their account, and not with the course,
   11: it takes time to compile the data and store it in the temporary course
   12: cache.  All of the statistics modes use the same cache so the process
   13: of compiling the student data does not need to be repeated when
   14: successive statistics are requested.
   15: 
   16: Only those students who are involved in the current calculation will
   17: have their data compiled.  When you modify the selected set of
   18: students, by changing the section you are computing statistics with,
   19: the caches will be updated.
   20: 
   21: The temporary course cache is maintained for 2 days on the server used
   22: for the statistics computation.
   23: 
   24: The cache management buttons, marked \textbf{Clear Caches} and
   25: \textbf{Update Caches}, appear when the temporary course caches are in
   26: use.  
   27: 
   28: \textbf{Clear Caches} causes the entire cache for the course to
   29: be flushed, discarding all the current contents.  The cache is then
   30: rebuilt to display the desired statistics.  The normal use of
   31: statistics should not require you to press this button, but it is here
   32: for completeness.
   33: 
   34: \textbf{Update Caches} checks the students' records for updates since when their 
   35: data was compiled.  Any changes to the students' record for your
   36: course will be reflected after this button has been pressed.  The
   37: \textbf{Update Caches} button is useful if your students are currently
   38: completing a homework set, and you wish to evaluate their progress in
   39: the timeframe your statistics were generated.
   40:
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