Document format of raw data

[domoritz]

I would like to use the raw data from the study to train a visualization recommendation tool. Unfortunately, I cannot make sense of the ranking or the format in the excel files. I would love to have something like a table (e.g. just CSV) of task, visualization, data, task, accuracy, time and for ranking something like task, data, visualization1, visualization2 where visualization 2 is (significantly) better than visualization 1.