TTest1w_df() returns the aggregated student's t-test df value (degrees of freedom) for a series of values.
This function applies to one-sample 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:
TTest1w_df (weight, value)
Return data type: numeric
Arguments:
| Argument | Description |
|---|---|
| value | The samples to be evaluated. If a field name for the sample values is not provided in the load script, the field will automatically be named Value. |
| weight | Each value in value can be counted one or more times according to a corresponding weight value in weight. |
Limitations:
Text values, NULL values and missing values in the expression value will result in the function returning NULL.
Example:
TTest1w_df( Weight, Value )