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A mathematical model that uses financial ratios and eight variables to identify whether a company has manipulated its earnings. The variables are constructed from the data in the company's financial statements and, once calculated, create an M-Score to describe the degree to which the earnings have been manipulated.
The z-score is the number of standard deviations you are from the mean of 0 (recall that by subtracting the mean and dividing the result by the standard deviation you convert your data to the standard normal distribution which has a mean of 0 and standard deviation of 1).