Description Usage Arguments Value Note Author(s) References Examples
The input to SPCDcontinuous
requires a logical field which says that the patient was not a placebo responder in the the first phase of the study. Usually this is determined by whether their outcome was greater than a specified value but could have other criteria. This an example program which specifies non-responders as patients whose first phase results were greater than a constant.
1 | placeboNonResponder(data, ID = "ID", k = 0)
|
data |
The data file to use to determine non-response. |
ID |
Text field indicating the name of the Patient ID variable. |
k |
A numeric constant. A patient is a non-responder if their change from baseline was greater than k. |
A new data frame with a variable named nonResponder
.
The choice of criteria should be specified in the protocol. One suggesting is to consider a non responder to be a patient who would still be eligible for the study.
David A. Schoenfeld, dschoenfeld@mgh.harvard.edu
Chen, Y. F., Yang, Y., Hung, H. J., & Wang, S. J. (2011). Evaluation of performance of some enrichment designs dealing with high placebo response in psychiatric clinical trials. Contemporary clinical trials, 32,4, 592-604.
1 2 | data1=createTestData(times=0:11,n=c(50,50,50),transition=5,rx1=0,rx2=0)
data1=placeboNonResponder(data1,k=0)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.