Hi Vijay,
The research work done by you is fabulous.
But do you really think that a pure statistical approach is the way to forecasting.
Surely, probability also plays a vital role.
That apart it is equally important to understand the process involved with each call.
The demography of the market one is serving.
Hope we arrive at a common model which is simple and can be used as a thumb rule by all regardless of the type of calls one manages.
Regards,
Arunabh.