We feel that this may not be a suitable way of measuring learning methods. First of all, the two measurements may not be correlated. More importantly, when using the number of responders in the top X deciles as the measurement, the distribution within the top X deciles and within the rest of the deciles can be skewed. For example, if the distribution of the top 4 deciles is 0, 0, 0, and 806, it will give the same score of 806, but that is clearly undesirable. It would be best to use just one number to measure the performance of learning algorithms based on the whole lift table.