create_dist_matrix: Create matrix of distances between strata

In natstrat: Obtain Unweighted Natural Strata that Balance Many Covariates

Description

Create a distance matrix between strata levels created from the interactions of factors. Used as input to generate_qs().

Usage

create_dist_matrix(...)

Arguments

...	any number of matrices that contain the distances between levels of a single stratifying factor. These should have both column and row names which correspond to the levels of the stratifying factor.

Value

Matrix containing the distances between all levels of the factor of all interactions between the inputted factors. The row and column names correspond to the levels of the strata, formed by combining the level name of each stratifying factor separated with ':'.

Examples

data('nh0506')

age_cat <- cut(nh0506$age,
               breaks = c(19, 39, 50, 85),
               labels = c('< 40 years', '40 - 50 years', '> 50 years'))

age_dist <- matrix(data = c(0, 1, 2, 1, 0, 1, 2, 1, 0),
                   nrow = 3,
                   byrow = TRUE,
                   dimnames = list(levels(age_cat), levels(age_cat)))

sex_dist <- matrix(data = c(0, 1, 1, 0),
                   nrow = 2,
                   dimnames = list(levels(nh0506$sex), levels(nh0506$sex)))

strata_dist <- create_dist_matrix(age_dist, sex_dist)

natstrat documentation built on Oct. 15, 2021, 5:12 p.m.