STDEV( )
Calculates the standard deviation of a set of values. Standard deviation is a statistic showing how widely values are dispersed from the mean value.
The expression specifying the values to use in the calculation. The data type must be numeric.
The numeric index of the group whose values to use in the calculation. 0 indicates the table, 1 indicates the first group, 2 indicates the second group, and so on. If you do not supply a value for groupLevel, the function performs the calculation over all the values in the table.
The standard deviation value of the specified set of values.
The following example calculates the standard deviation of values in the Population data field at the table level.
The following example calculates the standard deviation of values in the Population data field for each group at the first level.