This might be a very basic question, but I haven't found a clear answer anywhere, so I hope someone here can help.
How does one find the mean and standard deviation of a normal distribution that underlies a folded normal distribution?
In other words, if you have data that follows a folded normal distribution but want to "unfold" it, calculate the mean and stdev of the unfolded distribution, how do you go about it?
To go by an image (from Wikipedia). I have the green curve, but want the purple line:
Is it simply the mean and stdev from the folded normal equation, as described here?
Cheers!