I have a distribution that looks like this: U
In other words small and big values are more frequent than middle values. A better graphical example of the distribution is this: Here
So I have a couple of questions:
- Is there a function that can transform this distribution to a normal distribution?
I want to normalise my data because I want to calculate z-scores: $$z = (x - mean)/std$$ which assumes a normal distribution.
My other question is:
- Is there a variation of the z-scores calculation that do not assume a normal distribution of the data, or better that is aimed to the arcsine distribution?