Survival, Exponential, Accrual: Power Calculation Results - Quick Tab
Calculating Power
Select the Quick tab of the Survival, Exponential, Accrual: 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 N
- In the Start N box, enter the starting value of N to use in the Power vs. N power chart.
- End N
- In the End N box, enter the final value of N to use in the Power vs. N power chart.
- Start Lambda2
- In the Start Lambda2 box, enter the starting value of Lambda2 used in the Power vs. Lambda2 power chart.
- End Lambda2
- In the End Lambda2 box, enter the final value of Lambda2 used in the Power vs. Lambda2 power chart.
- Start Alpha
- In the Start Alpha box, enter the starting value of Alpha to use in the Power vs. Alpha power chart.
- End Alpha
- In the End Alpha box, enter the final value of Alpha to use in the Power vs. Alpha power chart.
- No. of Steps.
- In the No. of Steps box, enter the number of steps, or intervals, to plot on the X-axis in the power charts specified in the Power Charts group box.
- Power Charts
- Use the buttons under Power Charts to produce charts of power as a function of a number of variables that are known to affect it. Note that parameters given in the X-Axis Graphing Parameters group box control the range of values plotted on the X-axis and the number of steps plotted.
- Power vs. N.
- Click the Power vs. N button to produce a plot of power versus sample size N.
- Power vs. Lambda2.
- Click the Power vs Lambda2 button to produce a plot of power vs. Lambda2.
- Power vs. Alpha.
- Click the Power vs. Alpha button to produce a plot of power vs. Type I error rate.
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