data_dict_group_by {madshapR}

Group listed data dictionaries by specified column names

Description

Groups the data dictionary element(s) by the groups defined by the query. This function groups both the 'Variables' and 'Categories' elements (if the group exists under the same definition in in both). This function is analogous to running dplyr::group_by(). Each element is named using the group values. data_dict_ungroup() reverses the effect.

Usage

data_dict_group_by(data_dict, col)

Arguments

data_dict

A list of data frame(s) representing metadata to be transformed.

col

variable to group by.

Details

A data dictionary contains the list of variables in a dataset and metadata about the variables and can be associated with a dataset. A data dictionary object is a list of data frame(s) named 'Variables' (required) and 'Categories' (if any). To be usable in any function, the data frame 'Variables' must contain at least the name column, with all unique and non-missing entries, and the data frame 'Categories' must contain at least the variable and name columns, with unique combination of variable and name.

Value

A list of data frame(s) identifying a workable data dictionary structure.

See Also

dplyr::group_by(), data_dict_ungroup()

Examples

{

# use madshapR_DEMO provided by the package
# Create a list of data dictionaries where the column 'table' is added to 
# refer to the associated dataset. The object created is not a 
# data dictionary per say, but can be used as a structure which can be 
# shaped into a data dictionary.

data_dict_list <- list(
  data_dict_1 <- madshapR_DEMO$data_dict_TOKYO ,
  data_dict_2 <- madshapR_DEMO$data_dict_MELBOURNE)
names(data_dict_list) = c("dataset_TOKYO","dataset_MELBOURNE")

data_dict_nest <- data_dict_list_nest(data_dict_list, name_group = 'table')

data_dict_group_by(data_dict_nest, col = "table")

}