What methods would be most appropriate in trying to forecast when a directional change is likely to occur (in customers or revenue)? Which are most sensitive to the early signs of a change?
My company is making a strategic change that will result in one group of customers (and associated revenue) going down while another goes up. I have a regression-heavy predictive model that is hitting revenue and customers within +/-2% 3 months out, but this strategic change is bound do break that. How do I spot the change in advance so that I can incorporate it into my predictions?