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ZTestw_dif - script and chart function

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

This function applies to z-tests where the input data series is given in weighted two-column format.

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:  

ZTestw_dif ( weight, value [, sigma]) 

Return data type: numeric

Arguments:  

  • value: The values should be returned by value. A sample mean of 0 is assumed. If you want the test to be performed around another mean, subtract that value from the sample values.
  • weight: Each sample value in value can be counted one or more times according to a corresponding weight value in weight.
  • 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:  

ZTestw_dif( Weight, Value-TestValue)

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