All data must have the same number of columns
Rows
    - The first row consists of a dingle character H or L
    - Column 1 : H = high value, and L = low value, representing Outcome Positive
    - Other columns : H = high value, and L = low value, for Outcome Positive
Columns
    - Column 1 is an integer for Outcome. Only highest and lowest values used
    - Other columns are values of predictors