Description Usage Arguments Details Author(s) References See Also
Output from function OptimDes
is used to display the ETSL, ES and
EDA for a two-stage or three-stage design relative to a single-stage design as a
function of the combined-stage sample size or study length.
1 2 3 |
x |
Output from function |
xscale |
Scale of the x-axis. |
l.type |
Line types for the plot. Default is |
l.col |
Line colors for the plot. Default is |
CMadj |
If true, the sample sizes and times are adjusted by the ratio of the exact binomial to asymptotic normal sample size for the single stage design, as in Case and Morgan (2003). Proportional adjustment of times and sample sizes are made even if the accrual rates are not constant. This adjustment is valid for two-stage 1-group designs. Default is false. |
... |
Additional graphical parameters passed to function |
The plot displays the tradeoff between ETSL, EDA and ES as a function of
the combined sample size or study length. Robustness of the optimal design to
deviations from the target sample size can be explored. The plots
often suggest compromised designs achieving near-optimal results for
both EDA and ETSL may be a better choice. Test boundary values (C1L, C1U, etc), and numerical
values of other design parameters, can be obtained for a design
selected from the plots using function np.OptimDes
.
The plot also includes the times of the interim analysis (t1
, t1
) as a ratio to
the time for a corresonding single-stage analysis.
Bo Huang <bo.huang@pfizer.com> and Neal Thomas <neal.thomas@pfizer.com>
Huang B., Talukder E. and Thomas N. Optimal two-stage Phase II designs with long-term endpoints. Statistics in Biopharmaceutical Research, 2(1), 51–61.
Case M. D. and Morgan T. M. (2003) Design of Phase II cancer trials evaluating survival probabilities. BMC Medical Research Methodology, 3, 7.
Lin D. Y., Shen L., Ying Z. and Breslow N. E. (1996) Group seqential designs for monitoring survival probabilities. Biometrics, 52, 1033–1042.
Simon R. (1989) Optimal two-stage designs for phase II clinical trials. Controlled Clinical Trials, 10, 1–10.
print.OptimDes
, OptimDes
, np.OptimDes
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