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2008 May 02
0
Adaptive design code
...ival data for initial trial design (no adaption yet)
y.0<-start.0 + rexp(n.0,(log(2)/med.0))
y.a<-start.a + rexp(n.a,(log(2)/med.a))
### Compute number of events in generated sample at interim look ###
# Compute number of events in control and treatment groups at interim look
eventfirst.0<-sum(y.0<t.first)
eventfirst.a<-sum(y.a<t.first)
### Calculate conditional power at interim look under the original design
# estimate median survival for both groups at first look = number of events
# divided by sum of patient time at interim look (linearized rate)
pa...