NBDCtools (version 1.0.2)

join_tabulated: Join tabulated data

Description

Joins selected variables and/or whole tables from the tabulated data/shadow files into a single data frame. Expects the data files to be stored in one directory in .parquet or .tsv format, with one file per table following the naming convention of the respective NBDC dataset (from the ABCD or HBCD studies). Typically, this will be the rawdata/phenotype/ directory within a BIDS dataset downloaded from the NBDC Data Hub.

Variables specified in vars and tables will be full-joined together, i.e., all rows will be kept, even if they do not have a value for all columns. Variables specified in vars_add will be left-joined to the variables selected in vars and tables, i.e., only the values for already existing rows will be added and no new rows will be created. This is useful for adding variables to the dataset that are important for a given analysis but are not the main variables of interest (e.g., design/nesting or demographic information). By left-joining these variables, one avoids creating new rows that contain only missing values for the main variables of interest selected using vars and tables. If the same variables are specified in vars/tables and vars_add/tables_add, the variables in vars_add/tables_add will be ignored.

In addition to the main join_tabulated() function, there are two study-specific variations:

• join_tabulated_abcd(): for the ABCD study.

• join_tabulated_hbcd(): for the HBCD study.

They have the same arguments as the join_tabulated() function, except that the study argument is set to the respective study by default, and should not be set by the user.

Usage

join_tabulated(
  dir_data,
  study,
  vars = NULL,
  tables = NULL,
  vars_add = NULL,
  tables_add = NULL,
  release = "latest",
  format = "parquet",
  shadow = FALSE,
  remove_empty_rows = TRUE,
  bypass_ram_check = FALSE
)
join_tabulated_abcd(...)
join_tabulated_hbcd(...)

Value

A tibble of data or shadow matrix with the joined variables.

Arguments

dir_data

character. Path to the directory with the data files in .parquet or .tsv format.

study

character. NBDC study (One of "abcd" or "hbcd").

vars

character (vector). Name(s) of variable(s) to be joined. (Default: NULL, i.e., no variables are selected; one of tables or vars has to be provided).

tables

character (vector). Name(s) of table(s) to be joined (Default: NULL, i.e., no tables are selected; one of tables or vars has to be provided).

vars_add

character (vector). Name(s) of additional variable(s) to be left-joined to the variables selected in vars and tables (Default: NULL, i.e., no additional variables are selected)

tables_add

character (vector). Name(s) of additional table(s) to be left-joined to the variables selected in vars and tables (Default: NULL, i.e., no additional tables are selected)

release

character. Release version (Default: "latest")

format

character. Data format (One of "parquet" or "tsv"; default: "parquet").

shadow

logical. Whether to join the shadow matrix instead of the data table (default: FALSE).

remove_empty_rows

logical. Whether to filter out rows that have all values missing in the joined variables, except for the ID columns (default: TRUE).

bypass_ram_check

logical. If TRUE, the function will not abort if the number of variables exceeds 10000 and current available RAM is less than 75% of the estimated RAM usage. This can prevent the long loading time of the data, but failing in the middle due to insufficient RAM. For large datasets, it is recommended to save 2 times or more of estimated RAM before running this function.

This argument is only used for the ABCD study, as the HBCD data is small enough to be loaded without RAM issues with most personal computers. As HBCD data grows in the future, this may change.

...

Additional arguments passed to the underlying function join_tabulated()

Note: Turning this parameter to FALSE is useful for shadow matrices processing. Some shadow-related functions expect the shadow matrix to have the same dimensions as the original data to proceed correctly. See shadow_bind_data() and shadow_replace_binding_missing()

Examples

if (FALSE) {
join_tabulated(
  dir_data = "path/to/data/",
  vars     = c("var_1", "var_2", "var_3"),
  tables   = c("table_1", "table_2"),
  study    = "abcd",
  release  = "6.0"
)
}