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ZTest_sterr - script and chart function

ZTest_sterr() returns the aggregated z-test standard error of the mean difference for a series of values.

If the function is used in the load script, the values are iterated over a number of records as defined by a group by clause.

If the function is used in a chart expression, the values are iterated over the chart dimensions.

Syntax:  

ZTest_sterr(value[, sigma])

Return data type: numeric

Arguments:  

  • value: The sample values to be evaluated. A population mean of 0 is assumed. If you want the test to be performed around another mean, subtract that mean from the sample values.
  • sigma: If known, the standard deviation can be stated in sigma. If sigma is omitted the actual sample standard deviation will be used.

Limitations:  

Text values, NULL values and missing values in the expression value will result in the function returning NULL.

Example:  

ZTest_sterr(Value-TestValue)

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