Split and compare quantiles
This parameter is the easiest to sell to the C-level guys. “Did you know that with this model, if we chop the worst 20% of leads we would have avoided 60% of the frauds and only lose 8% of our sales?” That’s what this plot will give you.
The math behind the plot might be a bit foggy for some readers so let me try and explain further: if you sort from the lowest to the highest score all your observations / people / leads, then you can literally, for instance, select the top 5 or bottom 15% or so. What we do now is split all those “ranked” rows into similar-sized-buckets to get the best bucket, the second best one, and so on. Then, if you split all the “Goods” and the “Bads” into two columns, keeping their buckets’ colours, we still have it sorted and separated, right? To conclude, if you’d say that the worst 20% cases (all from the same worst colour and bucket) were to take an action, then how many of each label would that represent on your test set? There you go!
Read on to see what else he uses and how you can build it yourself.