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information non-increase K(f(x))≤K(x)+K(f) for computable functions f
If you run a computation function e.g. software algorithm on data, you cannot increase its information content by much except the length of the program itself.
Therefore if you are making a computation forecast based upon finite data, your forecast has certain amount of accuracy which is related to total amount information encapsulated into the data. If you run a computational functions on that data e.g. link strength or averaging you cannot increase the amount of information in that data by much i.e. almost nothing.
Therefore manipulation of the signal by computational functions will not increase its forecast accuracy by much, since it will not increase its amount of information.
What you could do is to add new data, which adds new information, therefore the amount of information is increased, possibly then you could make a more accurate forecast.