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TTestw_dif - script and chart function

TTestw_dif() returns the aggregated student's t-test mean difference for two independent series of values.

This function applies to two independent samples student's t-tests where the input data series is given in weighted two-column format.

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.

Syntax:  

TTestw_dif (weight, grp, value)

Return data type: numeric

Arguments:  

Arguments
ArgumentDescription
weightEach value in value can be counted one or more times according to a corresponding weight value in weight.
grpThe field containing the names of each of the two sample groups. If a field name for the group is not provided in the load script, the field will automatically be given the name Type.
valueThe sample values to be evaluated. The sample values must be logically grouped as specified by exactly two values in group. If a field name for the sample values is not provided in the load script, the field will automatically be named Value.

Limitations:  

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

Examples:  

TTestw_dif( Weight, Group, Value )

TTestw_dif( Weight, Group, Value, false )

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