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378487
2009 Jul 16
2
Weibull Prediction?
I am trying to generate predictions from a weibull survival curve but it
seems that the predictions assume that the shape(scale for
survfit) parameter is one(Exponential but with a strange rate estimate?).
Here is an examle of the problem, the smaller the shape is the worse the
discrepancy.
### Set Parameters
scale<-10
shape<-.85
### Find Mean
scale*gamma(1 + 1/shape)
### Simulate Data