I have a set of water quality data that are not random but I want use them in a Copula model so I should have random variables (I know it can done with time series analysis). Can anybody help me in finding a journal paper or book that I can use as a guide.
Copula is to describe the dependence between random variables but my data is a set of daily data which has TREND s.o. told me that I cant use the data with TREND (because it is not random) and I should do some work on it before using in copula
Data with a trend can most certainly be random. There are procedures that will require you to detrend your data but I would advise you to stop saying that your data isn't random just because there is a trend in it.