File:Funció de densitat dels temps de supervivència dels malalts amb sida de les dades Aids2 de la biblioteca MASS.svg

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Ænglisc: Density function of the lifetime distribution
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Author Pep Roca
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R code

##---------------------------------------------------------
## Funció de densitat de la probabilitat de supervivència
##---------------------------------------------------------
library(MASS)
## Càlcul del temps i variable estat
Aids2$DIES = Aids2$death - Aids2$diag
## Fer la variable muda (factor) ESTAT al final del seguiment
Aids2$ESTAT = as.integer(Aids2$status == "D")
## Selecció dels homosexuals (el valor de la variable ''T.categ'' és "hs") i les dos variables d'interès
AIDS2_HS = subset(Aids2, T.categ=="hs", select = c(DIES, ESTAT))
library(survival)
AIDS2_HS.KM <- survfit(Surv(AIDS2_HS$DIES, AIDS2_HS$ESTAT) ~ 1)
library(grDevices)
svg("mass_aids_hs_densitat.svg")
library(lattice)
densityplot(AIDS2_HS.KM$time, plot.points = F, main="Funció de densitat de la probabilitat de supervivència",
 xlab="Temps (dies des del diagnòstic)", ylab="f(t): Funció de densitat",  xlim=c(0, 2000))
dev.off()

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current10:48, 16 July 2012Thumbnail for version as of 10:48, 16 July 2012630 × 630 (48 KB)Pep Roca (talk | contribs)

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