translated number
GreenSock Docs (HTML5/JS)
SlowMo
.getRatio()
.getRatio( p:Number ) : Number
[override] Translates the tween's progress ratio into the corresponding ease ratio.
Parameters
p: Number
progress ratio (a value between 0 and 1 indicating the progress of the tween/ease)
Returns : Number

Details
Translates the tween's progress ratio into the corresponding ease ratio. This is the heart of the Ease, where it does all its work.