Never expected anyone would share anything for free?Then you won`t have anything,ever.THE MOST VALUABLE THINGS IN LIFE ARE SHARING FOR FREE!Only you`ve paid the price yet, by the time you get it.Should be ready for that.
The reason i shared this information,was that i wasn`t a programmer,so there was no reason to keep it for myself.Shewhart charts,if coded properly,could be very obvious.What i personally use,is semi-automated and i`d rather keep it for myself,even though there is no secret in it,too!