Definition: Given an independent variable x and a dependent variable y, the scedastic
function is the conditional variance of y given x. That variance of the
conditional distribution is:
var[y|x] = E[(y-E[y|x])2|x]
var[y|x] = integral or sum of (y-E[y|x])2f(y|x) dy
var[y|x] = E[y2|x] - (E[y|x])2. (Econterms)
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