Is there any materials on how to use daily parameter optimization?

I thought that the main point of parameter optimization is finding the optimal set of 
parameters for a given stock basing on the back testing. I.e. finding the parameters 
that, if used in the past N days, would have maximized the profit from the trades 
performed according to the signals generated by those parameters. And then using that 
set with the expectation that the set would perform on this stock equally well in the 
future.
Therefore, the essence is that the parameter set is constant for each stock.

Do I understand it right? If so, then what's the point of calculating DAILY optimal 
parameters? The result of that calculation is a table with another profit each day. 
What does it mean? how does it work?


thanks







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