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2.1.27
2016 Aug 11
3
Comparación de probabilidades de supervivencia en R
Estimados miembros de la lista,
Estoy haciendo una análisis de supervivencia con R. Adjunto mis datos.
Quiero analizar la supervivencia de 5 grupos diferentes y compararla. Para
ello estoy utilizando el paquete survival.
> s = Surv(c$tiempo, c$estado)
> f = survfit(s ~ tratamiento, data = c)
> d = survdiff(s ~ tratamiento, data = c)
> d
Call:
survdiff(formula = s ~ tratamiento,
2005 May 26
0
Confidence intervals for prediction based on the logistic equation
Greetings,
We are performing a meta-analysis of mink pup survival data versus
chemical concentration. We have modeled percent survival successfully
using nls as shown below and the plot. What we need to do is construct a
confidence interval on the concentration at which we get 50% survival
(aka the EC50, although we may want other percent survivals in the
future). My first question is, what seems