Searches across datasets specified for requested survey variables.
This function (or search_variable_labels)
should be used to provide the `questions` argument
for extract_dhs.
Arguments
- dataset_filenames
The desired filenames to be downloaded. These can be found as one of the returned fields from
dhs_datasets.- variables
Character vector of survey variables to be looked up
- essential_variables
Character vector of variables that need to present. If any of the codes are not present in that survey, the survey will not be returned by this function. Default = `NULL`.
- ...
Any other arguments to be passed to
download_datasets
Value
A data.frame of the surveys where matches were
found and then all the resultant codes and descriptions.
Details
Use this function after get_datasets to look up all
the survey variables that have the required variable.
Examples
if (FALSE) {
# get the model datasets included with the package
model_datasets <- model_datasets
# download two of them
g <- get_datasets(dataset_filenames = model_datasets$FileName[1:2])
# and now seearch within these for survey variables
search_variables(
dataset_filenames = names(g), variables = c("v002","v102","ml13"),
)
# if we specify an essential variable then that dataset has to have that
# variable or else no variables will be returned for that datasets
search_variables(
dataset_filenames = names(g),
variables = c("v002","v102","ml13"),
essential_variables = "ml13"
)
}