Description: Returns the inverse of the standard normal cumulative distribution. The distribution has a mean of zero and a standard deviation of one; i.e., normsinv seeks that value z such that a normal distribtuion of mean of zero and standard deviation one is equal to the input probability.
normsinv(y0) Returns the inverse of the standard normal cumulative distribution. The distribution has a mean of zero and a standard deviation of one. Parameters: y0: float, probability corresponding to the normal distribution. Returns: float, z-score