what is phi in edgeworth what is $f_n$ used for? what is the density function of the edgeworth expansion what is the density function of a variable what is the density function of $f_n$ what is the density function of f_n what is the density of the inverse fourier transformation cdf? what is the density function of f_n in the inverse fourier transform what is the base of edgeworth expansion used for which random variable's density function is used for two different purposes? when calculating edgeworth expansion which random variable is a density function? what is the density function of an example of a linear distribution which notation is used for the same purpose? which variable has an inverse fourier transformation that is used for two different purposes? which exponential function follows the density function of a random variable what is the density function of the variable used what type is $F_n$ for which random variable's density function is it? why is a density function in f n used