Nothing
sigma2_hat_S1mS2 <- function(t, fit, fit1, fit2) {
n <- fit$n
out <- 1:length(t)*0
for (i in 1:length(t)) {
d1 <- fit1$n.event[fit1$time <= t[i] & fit1$n.event != 0]
r1 <- fit1$n.risk [fit1$time <= t[i] & fit1$n.event != 0]
d2 <- fit2$n.event[fit2$time <= t[i] & fit2$n.event != 0]
r2 <- fit2$n.risk [fit2$time <= t[i] & fit2$n.event != 0]
tcalc1 <- t[i] - fit1$time
tcalc1[tcalc1 < 0] <- Inf
which.min(tcalc1)
tcalc2 <- t[i] - fit2$time
tcalc2[tcalc2 < 0] <- Inf
which.min(tcalc2)
S1 <- fit1$surv[which.min(tcalc1)]
S2 <- fit2$surv[which.min(tcalc2)]
out[i] <- product(S1^2, sum(division00(d1, r1*(r1 - d1)))) + product(S2^2, sum(division00(d2, r2*(r2 - d2))))
}
return (out)
}
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