make_instrument function

Extract an Instrument from an REDCap Export

This function takes a data frame and the names of the first and last variables in an instrumnt and returns a data frame with the instrument.

make_instrument(
  df,
  first_var,
  last_var,
  drop_which_when = FALSE,
  record_id = "record_id"
)

Arguments

• df: A data frame with the instrument
• first_var: The name of the first variable in an instrument
• last_var: The name of the last variable in an instrument
• drop_which_when: Drop the record_id and redcap_event_name variables
• record_id: Name of record_id variable (if it was changed in REDCap)

Returns

A data frame that has an instrument (with at least one not NA value)