Survival, Exponential, Accrual, Dropouts: Sample Size Calculation Results - Quick Tab

Select the Quick tab of the Survival, Exponential, Accrual, Dropouts: Sample Size Calculation Results dialog box to access options to interactively view the results of sample size calculations and generate plots of required sample size as a function of quantities that affect sample size 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 Sample Size Charts.

Start Power

In the Start Power box, enter the starting value of the power goal used in the N vs. Power sample size chart.

End Power

In the End Power box, enter the final value of the power goal used in the N vs. Power sample size chart.

Start Lambda2

In the Start Lambda2 box, enter the starting value of Lambda2 used in the N vs. Lambda2  chart.

End Lambda2

In the End Lambda2 box, enter the final value of Lambda2 used in the N vs. Lambda2 chart.

Start Alpha

In the Start Alpha box, enter the starting value of alpha to use in the N vs. Alpha sample size chart.

End Alpha

In the End Alpha box, enter the final value of alpha to use in the N vs. Alpha sample size 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 charts specified in the Sample Size Charts group box.

Sample Size Charts

Use the buttons under Sample Size Charts to produce charts of required N as a function of power goal, exponential parameter, or type I error rate. Note that parameters given under X-Axis Graphing Parameters control the range of values plotted on the X-axis and the number of steps plotted.

N vs. Lambda2. Click the N vs. Lambda2 button to produce a plot of sample size vs. Lambda2.

N vs. Alpha.

Click the N vs. Alpha button to produce a plot of N vs. Type I error rate.

N vs. Power.

Click the N vs. Power button to produce a plot of N versus power goal.