generate_condprob {R6causal}

Define structural function by a conditional probability table

Description

Define structural function by a conditional probability table

Usage

generate_condprob(ycondx, x, Umerge_expr = NULL)

Arguments

ycondx

A data table or a data frame with the following structure

• 1st column: variable to be generated, "Y"

• middle columns: the parents of the the 1st column variable, "X"

• last column: the probability the case specified be the other columns, "P(Y|do(X))"

x

A data table or a data frame that contains data on the variables in the middle columns of ycondx, "X" and one or more columns giving data on U-variables.

Umerge_expr

A character string specifying how the U-variables will be combined when the value "Y" is generated, e.g. "u" or "(u1+u2)/2". The result of the expression should be a random number in the interval [0,1].

Value

A data table containing the generated variable, "Y"

Examples

ycondx <- data.table::data.table(y =rep(c(0,1), each = 3), x=rep(1:3, 2),
                     prob = c(0.2,0.6,0.1,0.8,0.4,0.9))
x <- data.table::data.table(x = sample(1:3, 20, replace = TRUE),
                       uy = stats::runif(20), uy2 = stats::runif(20))
generate_condprob(ycondx, x, Umerge_expr = "(uy+uy2)/2")