Z Score

Posted in Statistics, Total Reads: 1319

Definition: Z Score

Z Score refers to the number of standard deviations the score( the data element) is away from the mean of the given distribution. It can be positive, negative or 0. It helps is better comparison of data with different groups of data through the process of standardization.

It is done as under:


Z-S core= (Score- Mean) /Standard Deviation


A  Z score=0 means that the element is same as the mean. If it is positive then the element is above group mean and if it is negative then it is below group mean.

Example: Z score=1 means that the element is 1 standard deviation above the group mean

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