> 2. The answer will be wrong. The reason is that the censoring occurs on a
> time scale, not a $ scale: you don't stop observing someone because
> total cost hits a threshold, but because calendar time does. The KM routines
> assume that the censoring process and the event process are on the
> same scale.
> The result can be an overestimation of cost. See Dan-Yu Lin, Biometrics
> 1997, "Estimating medical costs from incomplete follow-up data".
Having now skimmed the paper this is long term follow-up. In my particular
case the patients are getting treatment for relatively short periods (median
time to stopping treatment will be ~ 9months) and will discontinue treatment
relatively quickly (I'd be surprised if anyone is still on treatment 3-4 years
out). I only want the costs of that treatment not the costs for their overall
care to death. I'm not sure how that affects things but hoping it makes life
simpler.
Calum
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