I'm using min-max normalization to normalize time series which I compare in the following.
My question is, by definition min-max normalization is defined as:
My question is, what should the new value be if all values in the array are same? That is, max=min.
One possibility is to set all elements to 0, the other is to set them all to 1. I could also set all values to half of the range, that is 0.5. But what is the proper approach?