Stack NHANES data across multiple cycles

Row-binds the same component across multiple cycles, enforcing that the cycle column is present and handling variable name changes across cycles.

Usage

nhanes_stack(..., fill = TRUE)

Arguments

...

Named or unnamed data frames, each representing one cycle's data for the same component.

fill

Logical. If TRUE (default), columns present in some but not all cycles are filled with NA in cycles where they are absent. If FALSE, only columns common to all cycles are retained.

Value

A single data frame with all cycles stacked. A cycle column is always included.

See also

nhanes_harmonize() which calls this internally and also renames variables across cycles; nhanes_merge() to join components by SEQN; nhanes_mortality_link() which expects a stacked data frame as input.

Examples

# \donttest{
demos <- nhanes_download("DEMO", c("2013-2014", "2015-2016", "2017-2018"))
stacked <- nhanes_stack(demos)
# }