Provide all combinations of strata levels.

Provide all combinations of strata levels.

Usage

combineStrata(levels, overall = FALSE)

Arguments

levels

Vector of all strata levels to combine.

overall

Whether to provide an empty element character().

Value

A vector of all combinations of strata.

Examples

combineStrata(character())
#> list()
combineStrata(character(), overall = TRUE)
#> [[1]]
#> character(0)
#> 
combineStrata(c("age", "sex"), overall = TRUE)
#> [[1]]
#> character(0)
#> 
#> [[2]]
#> [1] "age"
#> 
#> [[3]]
#> [1] "sex"
#> 
#> [[4]]
#> [1] "age" "sex"
#> 
combineStrata(c("age", "sex", "year"))
#> [[1]]
#> [1] "age"
#> 
#> [[2]]
#> [1] "sex"
#> 
#> [[3]]
#> [1] "year"
#> 
#> [[4]]
#> [1] "age" "sex"
#> 
#> [[5]]
#> [1] "age"  "year"
#> 
#> [[6]]
#> [1] "sex"  "year"
#> 
#> [[7]]
#> [1] "age"  "sex"  "year"
#>