All,
Apologies for the simplistic nature of my question, I'm only just
scratching the surface of the functionality of SPSS (version 15).
I've got a simple problem which relates to forecasting of monthly
payments. I need to forecast out payments in the future based on 15
months of historical payments (month1, month 2...month 15) as variables by
3000 cases.
At the simplest level, someone who has paid $40 per month for the last 15
months will be forecasted to carry on paying at this level, but I don't
know how to add the functionality of a reducing balance. For example, if
the case had an initial balance of $700 and has been paying $40 per month
then the balance would be paid down by month 18 (3 months into my
forecast).
I assume forecasting using cumulative percentages (up to 100%) would be
the way to go, but I don't know how to add this maximum level into a
forecast methodology (or if it is possible at all).
Regards,
John Cardiff
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