I want to know how I can compare the "behavior of curves" and see what curves behave more similar. In the link below, in the 1st graph we have 4 curves through out time.
I want to know when the market went up,the market went down in the past, and which of these curves behaves similar (if they went up and went down or were steady). I also want to find what are the most similar curves.
How should I approach this problem?
Any statistical test(s) I can use for this?