Power Analysis for Survival Analysis, Exponential with Accrual & Dropouts (Power Calculation)
Power calculation for Survival Analysis, Two-group test of equal exponential with accrual and dropouts, with options for charts of Power vs. Sample Size, vs. Lambda 2, and vs. Alpha Level
General
Element Name | Description |
---|---|
Lambda 1 | Exponential parameter for group 1. |
Lambda 2 | Exponential parameter for group 2. |
Sample Size (N) | Sample size for the power calculation (acceptable range 2 to 150000). |
Accrual Period (T0) | Accrual period for the power calculation (acceptable range 1 to 10000). |
Follow-up Period (T) | Follow-up period for the power calculation (acceptable range 1 to 10000). |
Dropout Rate (D) | Dropout Rate for the power calculation. |
Alpha Level | Alpha level (Type I error rate for the overall significance test) (Acceptable range 0.0001 to 0.25) |
Hypothesis type | Null hypothesis to be tested: Lambda 2 = Lambda 1, (Two-tailed, null and alternative hypotheses of form - H0: Lambda2 = Lambda1, H1: Lambda2 <> Lambda1) Lambda 2 <= Lambda 1, (One-tailed, null and alternative hypotheses of form - H0: Lambda2 <= Lambda1, H1: Lambda2 > Lambda1) |
Detail of computed results reported | Output level of detail selection: Power Calculation produces Power Calculation Spreadsheet; Pwr Calc plus Charts option produces, in addition, Power vs. Sample Size, vs. Lambda 2, and vs. Alpha Level charts. |
Chart Parameters
Element Name | Description |
---|---|
Number of Steps | (For charts only). Number of individual steps for which to calculate power between the starting and ending parameter values for Power Charts (Min 4, Max 100). |
Starting Sample Size | (For charts only). Initial sample size for calculation of all Power vs. Sample Size charts. (Acceptable range 2 to 140,000) |
Ending Sample Size | (For charts only). Final sample size for calculation of all Power vs. Sample Size charts. (Acceptable range 5 to 150,000) |
Starting Lambda 2 | (For charts only). Initial Lambda 2 value for calculation of Power vs. Lambda 2 chart (acceptable range 1e-010 to 0.9999). |
Ending Lambda 2 | (For charts only). Final Lambda 2 value for calculation of Power vs. Lambda chart (acceptable range 1e-005 to 0.9999). |
Starting Alpha Level | (For charts only). Initial alpha level for calculation of Power vs. Alpha Level chart (acceptable range 0.0001 to 0.2499). |
Ending Alpha Level | (For charts only). Final alpha level for calculation of Power vs. Alpha Level chart (acceptable range 0.0002 to 0.25). |
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