Nothing
integ_cgamma <- function(u, event, base.dist, base.est, xbeta, cuts, kappa) {
# correlated gamma frailties
k0 <- kappa[3]
k1 <- kappa[1]
k2 <- kappa[2]
w1 <- k0 + k1
w2 <- k0 + k2
haz1 <- hazards(u, dist=base.dist[1], parms=base.est[[1]], cuts=cuts) * exp(xbeta[1])
haz2 <- hazards(u, dist=base.dist[2], parms=base.est[[2]], cuts=cuts) * exp(xbeta[2])
H1 <- cumhaz(base.dist[1], u, base.est[[1]], cuts=cuts)*exp(xbeta[1])
H2 <- cumhaz(base.dist[2], u, base.est[[2]], cuts=cuts)*exp(xbeta[2])
h <- (event==1)*haz1 + (event==2)*haz2
integ_pen <- h * (1 + H1/w1)^(-k1) * (1 + H2/w2)^(-k2) * (1 + H1/w1 + H2/w2)^(-k0) *
(k0/w1 * (1 + H1/w1 + H2/w2)^(-1) + k1/w1 * (1 + H1/w1)^(-1))
return(integ_pen)
}
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