Download NHANES data files.

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Description

Download NHANES data files.

Usage

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nhanes_load_data(file_name, year, destination = tempdir(),
  demographics = FALSE, cache = TRUE, recode = FALSE,
  recode_data = FALSE, recode_demographics = FALSE,
  allow_duplicate_files = FALSE)

Arguments

file_name

NHANES file name (e.g. "EPH") or a vector of filenames (e.g c("EPH", "GHB"))

year

NHANES cycle year (e.g. "2007-2008") or a vector of cycle years

destination

directory to download the files to

demographics

include demographics data into the dataset

cache

whether to cache the file to disk

recode

whether to recode the data and demographics (overrides other parameters)

recode_data

whether to recode just the data

recode_demographics

whether to recode just the demographics

allow_duplicate_files

how to handle a request that has duplicate file names/cycle years. By default duplicates will be removed.

Details

If you supply vectors for both file_name and year, then the vectors are paired and each file_name/year pair is downloaded. For example, file_name = c("EPH, GHB"), year = c("2009-2010", "2011-2012") will download "EPH_F.XPT" and "EPH_G.XPT". In other words, the function does not download every possible combination of file_name and year.

You can specify file names in several formats. In order of specificity: You can supply the complete filename: "EPH_F.XPT" You can supply the filename without an extension: "EPH_F" You can supply the filename without a suffix: "EPH", year = "2009-2010"

If you are loading the same file across multiple years, you must supply the filename without a suffix so that the correct suffix for each year can be used.

This function returns either a list or a data frame. If you load multiple files, the return value will always be a list. This is because the columns may not match in between files. If you load one file, the result will be a data frame.

Value

if file_name or year is a vector, returns a list containing a data frame for each file_name. If file_name and year are both singletons, then a data frame is returned.

Examples

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## Not run: 

nhanes_load_data("UHG", "2011-2012")

# Load data with demographics
nhanes_load_data("UHG", "2011-2012", demographics = TRUE)

# Download to /tmp directory and overwrite the file if it already exists
nhanes_load_data("HDL_E", "2007-2008", destination = "/tmp", cache = FALSE)

## End(Not run)

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