generate_causal_survival_data: Simulate causal survival data

In grf: Generalized Random Forests

Simulate causal survival data

Description

The following DGPs are available for benchmarking purposes, T is the failure time and C the censoring time:

• "simple1": T = X1*eps + W, C ~ U(0, 2) where eps ~ Exp(1) and Y.max = 1.

• "type1": T is drawn from an accelerated failure time model and C from a Cox model (scenario 1 in https://arxiv.org/abs/2001.09887)

• "type2": T is drawn from a proportional hazard model and C from a accelerated failure time (scenario 2 in https://arxiv.org/abs/2001.09887)

• "type3": T and C are drawn from a Poisson distribution (scenario 3 in https://arxiv.org/abs/2001.09887)

• "type4": T and C are drawn from a Poisson distribution (scenario 4 in https://arxiv.org/abs/2001.09887)

• "type5": is similar to "type2" but with censoring generated from an accelerated failure time model.

Usage

generate_causal_survival_data(
  n,
  p,
  Y.max = NULL,
  y0 = NULL,
  X = NULL,
  rho = 0,
  n.mc = 10000,
  dgp = c("simple1", "type1", "type2", "type3", "type4", "type5")
)

Arguments

n	The number of samples.
p	The number of covariates.
Y.max	The maximum follow-up time (optional).
y0	Query time to estimate P(T(1) > y0 | X) - P(T(0) > y0 | X) (optional).
X	The covariates (optional).
rho	The correlation coefficient of the X's covariance matrix V_ij = rho^|i-j|. Default is 0.
n.mc	The number of monte carlo draws to estimate the treatment effect with. Default is 10000.
dgp	The type of DGP.

Value

A list with entries: 'X': the covariates, 'Y': the event times, 'W': the treatment indicator, 'D': the censoring indicator, 'cate': the treatment effect (RMST) estimated by monte carlo, 'cate.prob' the difference in survival probability, 'cate.sign': the true sign of the cate for ITR comparison, 'dgp': the dgp name, 'Y.max': the maximum follow-up time, 'y0': the query time for difference in survival probability.

Examples

# Generate data
n <- 1000
p <- 5
data <- generate_causal_survival_data(n, p)
# Get true CATE on a test set
X.test <- matrix(seq(0, 1, length.out = 5), 5, p)
cate.test <- generate_causal_survival_data(n, p, X = X.test)$cate

grf documentation built on Oct. 1, 2023, 1:07 a.m.