Initialize a cohort of USRDS patients

Initializes a cohort of USRDS patients. Data set must have a variable named USRDS_ID.

Usage

create_usrds_cohort(df, start_date, end_date)

Arguments

df

is a data frame used to initialize a USRDS data frame. Typically, this is a data frame created from the PATIENTS file, potentially merged with the MEDEVID file or other files with baseline variables which are to be time-invariant. USRDS_ID must be unique or the function will error.

start_date

is a fixed data or a date variable in the df data frame specifying when each patient is considered to enter the cohort.

end_date

is a fixed data or a date variable in the df data frame specifying when each patient is considered to exit the cohort.

Value

A data frame and tmerge class object with columns cohort_start_date and cohort_stop_date added, which take values based on the start_date and end_date passed to the function, as well as tstart and tstop helper numbers

Examples

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