ZTest_conf() returns the aggregated z value for a series of values.
If the function is used in the data 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.
ZTest_conf(value[, sigma[, sig]])
Return data type: numeric
|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.|
|sig||The two-tailed level of significance can be specified in sig. If omitted, sig is set to 0.025, resulting in a 95% confidence interval.|
Text values, NULL values and missing values in the expression value will result in the function returning NULL.