Walk forward in practice means N + n = current year, and N + n + m is in the future. This offers sociological advantages:
- Management can not complain that you are not using all the (expensive) data available to you.
- Your model can not be invalidated on the spot, and can keep running. There is always hope that future data are going to fit in. And if not, you will have time to find an explanation why not.
Walk forward in practice means N + n = current year, and N + n + m is in the future. This offers sociological advantages:
- Management can not complain that you are not using all the (expensive) data available to you.
- Your model can not be invalidated on the spot, and can keep running. There is always hope that future data are going to fit in. And if not, you will have time to find an explanation why not.