R/fit_mechanisms.R
fit_g_mech.RdFit propensity score with incremental stochastic shift intervention
fit_g_mech(data, valid_data = NULL, delta, learners, w_names)A data.table containing the observed data, with columns
in the order specified by the NPSEM (Y, Z, A, W), with column names set
appropriately based on the original input data. Such a structure is merely
a convenience utility to passing data around to the various core estimation
routines and is automatically generated by medshift.
A holdout data set, with columns exactly matching those
appearing in the preceding argument data, to be used for estimation
via cross-fitting. Optional, defaulting to NULL.
A numeric value indicating the degree of shift in the
intervention to be used in defining the causal quantity of interest. In the
case of binary interventions, this takes the form of an incremental
propensity score shift, acting as a multiplier of the odds with which a
given observational unit receives the intervention (EH Kennedy, 2018, JASA;
doi:10.1080/01621459.2017.1422737).
A Stack (or other learner class that
inherits from Lrnr_base), containing a single or set of
instantiated learners from sl3, to be used in fitting the propensity
score, i.e., g = P(A | W).
A character vector of the names of the columns that
correspond to baseline covariates (W). The input for this argument is
automatically generated by medshift.