Last Modified Date: 19 Jan 2019
AnswerThe calculation Tableau Desktop is running for Standard Deviation is what every text book lists as the definition of standard deviation.
The -1/1 factor is AVG - 1*STDEV and AVG + 1*STDEV and the -2/2 factor is AVG - 2*STDEV and AVG + 2*STDEV.
Additional InformationThe attached workbook contains examples of calculating the -1/+1 manually using Table Calculation Functions.
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