I am afraid that your question is not very clear. What do you mean by time interval and by interval variability of yield? What is your domain of interest?
Hi there, you need to be more clear as in what do you mean by variability yield is minimum? If you are doing time series regression, the independent variables have to be independent and stationary. Maybe you can create a table in excel first, with the time series on the first column, followed by the dependent and independent variables. Hope it helps!
Suppose we have a timeseries of daily temperature. If I want to make 12 classes based on monthly average, there will be more variability in the data, so I want to redefine month instead of say january 1 to january 31as january 5 to february 5 so that variability will be reduced. such variance minimising time intervals I want.