ddFixed | R Documentation |
Functions used in formula of ddhazard
for time-invariant effects. ddFixed_intercept
is only used for the intercept.
ddFixed(object) ddFixed_intercept(random_intercept = FALSE)
object |
expression that would be used in formula. E.g. |
random_intercept |
|
Returns the passed object.
# we can get a time-invariant effect of `x1` by set.seed(1) dat <- data.frame(stop = 1:20, event = rep(c(TRUE, FALSE), 10L), x1 = rnorm(20)) ddhazard(Surv(stop, event) ~ ddFixed(x1), dat, Q_0 = diag(1), by = 1, Q = diag(1)) # all of the calls below will yield the same result with a time-invariant # intercept: ddhazard(Surv(stop, event) ~ ddFixed_intercept() + x1, dat, Q_0 = diag(1), by = 1, Q = diag(1)) ddhazard(Surv(stop, event) ~ -1 + ddFixed_intercept() + x1, dat, Q_0 = diag(1), by = 1, Q = diag(1))
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