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Finalize a USRDS cohort

Source: R/finalize_usrds_cohort.R
finalize_usrds_cohort.Rd

This function accepts a data frame that is a USRDS longitudinal cohort, and returns the same object with the tstart and tstop variables shifted to an appropriate baseline t=0 as specified by baseline_date_variable.

Usage

finalize_usrds_cohort(USRDS_cohort, baseline_date_variable = NULL)

Arguments

USRDS_cohort

is a USRDS cohort created using the create_usrds_cohort() function

baseline_date_variable,

if not NULL, includes the name of the variable in USRDS_cohort that determines the t0 date for each row of the cohort

Value

A data frame that is a USRDS cohort object

Details

Of note,baseline_date_variable does NOT have to be constant within each patient. If the baseline is the time since most recent transplant, for example, and a patient has multiple transplants within the USRDS_cohort, it may be appropriate for different observations periods for the same patient to use different baseline dates.

If baseline_date_variable is unspecified or specified as NULL, its default value, a default baseline value will be calculated for each patient such that each patient's first observation has tstart=0.

Examples

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