Kalman filter on Timeseries

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After a lot of research on Kalman filter I can't find anywhere how exactly the filter works on timeseries.Specifically, I want to know about fοrecasting with Kalman filter on Timeseries, point estimation and forecast intervals or a simple example.If my question sounds general, it would be nice if someone tells me where to search about this topic. Sorry for my bad english

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For time series use the discrete Kalman filter as described the chapter 4.1. here.

I guess the point is how to formulate a given problem as a Kalman problem which means achieving the following formulation out of the initial formulation of the problem:

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I learned this problem reformulating challenge, especially when developing my answer here.

The solution itself is IMHO well documented in the references. It’s executing or implementing the following algorithm:

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