TTest1_lower() returns the aggregated value for the lower end of the confidence interval for a series of values.
This function applies to one-sample student's t-tests.
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:
TTest1_lower (value [, sig])
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. |
| 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. |
Limitations:
Text values, NULL values and missing values in the expression value will result in the function returning NULL.
Examples:
TTest1_lower( Value )
TTest1_lower( Value, 0.005 )