ipsi function

IPSI Function Factory

A function factory that returns a shift function for increasing or decreasing the probability of exposure when exposure is binary.

ipsi(delta)

Arguments

• delta: [numeric(1)]

  A risk ratio between 0 and Inf.

Returns

A shift function.

Examples

data("iptwExWide", package = "twang")
a <- paste0("tx", 1:3)
baseline <- c("gender", "age")
tv <- list(c("use0"), c("use1"), c("use2"))
lmtp_sdr(iptwExWide, a, "outcome", baseline = baseline, time_vary = tv,
         shift = ipsi(0.5), outcome_type = "continuous", folds = 2)

See Also

lmtp_tmle(), lmtp_sdr(), lmtp_sub(), lmtp_ipw()