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)

Value

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