View source for Learning Curve Point Info Details: Add Frequency

'''Status: Done (DataShop v4.0 December 2009)'''

== User Story ==
As a user of the learning curve point info details feature, I want to see the frequency of each item in the detailed list of items (KCs, students, problems, steps), so that I can see the difference more clearly. 

== Notes/Comments ==

* Ken, Meeting 7/10/2009: In the learning curve point info details, have a column that gives the frequency (% the number of observations divided by the total observations) or just the number of observations. Maybe showing 'Observations' is best as the title is easy to figure out. 
** Example: Geometry 96 dataset, zoomed in circle-area, at opp 5, which steps...go back one opp, what's the difference.

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