Get item-by-age summary statistics

Usage

summarise_items(item_data, version = "current")

Arguments

item_data: A dataframe as returned by get_item_data().
version: A string specifying which version of the Wordbank dataset to use, e.g. "v1.2" to pin a released version for reproducibility. Defaults to "current", the most recent release.

Value

A dataframe with a row for each combination of item and age, and columns for summary statistics for the group: number of children (n_children), means (comprehension, production), standard deviations (comprehension_sd, production_sd); also retains item-level variables from lang_items (item_id, item_definition, uni_lemma, lexical_category) and dataset_version.

Examples

if (FALSE) { # \dontrun{
italian_items <- get_item_data(language = "Italian", form = "WG")
if (!is.null(italian_items)) {
  italian_dog <- dplyr::filter(italian_items, uni_lemma == "dog")
  italian_dog_summary <- summarise_items(italian_dog)
}
} # }