I have several plots of some data that I collect everyday. I need some method to quantify the similarity between their shapes only without considering the Y-axis values. I can see from the figures below that the difference between the first and the last points is around 2.8 for both. X-axis values are the same for both curves. This is one set of curves:
If I calculate 2-D correlation (corr2) for these two vectors, I get a value of around 0.97. Is corr2 an accurate measure of similarity?
Any help would be greatly appreciated!