The Lift Chart also shows the lift factor between different points on the x-coordinate. It shows a factor f if you take into account about n% of the data.
In the Lift Chart, the random curve is always represented as a horizontal line. At that point in the chart where the model curve declines below the random curve, the lift factor is smaller than 1. This means that the records of the model contain fewer target values than a random sample with equally distributed target values.
The x-coordinate of the Lift Chart shows the percentage of the cumulated number of sorted data records of the current model. The data records are sorted in descending order by the confidence that the model assigns to a prediction of the selected value of the target field.
You can specify to display absolute values or percentages of the total amount of records.
The y-coordinate of the Lift Chart shows the ratio between the results that are obtained with a model and without a model.
You can specify to display average values for the target field in percent or the lift factor.
If you specified to display the lift factor by selecting the Lift Factor radio button in the Properties notebook, the y values from the absolute scaling are divided by the random value.