One Variance: Power Calculation Results - Quick Tab

Calculating Power

Select the Quick tab of the One Variance: Power Calculation Results dialog box to access options to interactively view the results of power calculations and generate plots of power as a function of quantities that affect power in practice.

X-Axis Graphing Parameters. The entries in the boxes under X-Axis Graphing Parameters establish the start value, end value, and number of steps on the X-axis for the graphs specified under Power Charts.

Start Df. In the Start Df box, enter the starting value of Df used in the Power vs. Df power chart.

End Df. In the End Df box, enter the final value of Df used in the Power vs. Df power chart.

Start Var. In the Start Var. box, enter the starting value of Var used in the Power vs. Var power chart.

End Var. In the End Var. box, enter the final value of Var used in the Power vs. Var power chart.

Start Alpha. In the Start Alpha box, enter the starting value of Alpha used in the Power vs. Alpha power chart.

End Alpha. In the End Alpha box, enter the final value of Alpha used in the Power vs. Alpha power chart.

No. of Steps. In the No. of Steps box, enter the number of steps, or intervals, plotted on the X-axis in the power charts specified in the Power Charts box.

Power Charts. Use the buttons under Power Charts to produce charts of power as a function of degrees of freedom, population variance, or type I error rate. The range of values plotted on the X-axis, and the number of steps plotted, are controlled by parameters in the X-Axis Graphing Parameters box.  

Power vs. Df. Click the Power vs. Df button to produce a plot of power versus degrees of freedom Df, for the test .

Power vs. Var. Click the Power vs. Var. button produce a plot of power versus population variance (Var).

Power vs. Alpha. Click the Power vs. Alpha button to produce a plot of power vs. type I error rate (Alpha ).