Although not exactly what you are asking, if you check out the home page (of minergain.com) you will see a CDT (Coins per Day per Th/s) for Kano / Slush that is updated every 15 minutes for the past week, month, quarter and year.  Some of these are hidden on mobile phones so use a desktop to see them all.  Obviously this the past - which has no impact on future "randomness", but should give some idea what the long term results may be.  The one big thing to notice is how rapidly Slush is decreasing.