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Derive Time Relative to Reference

Source: R/derive_var_atirel.R
derive_var_atirel.Rd

[Deprecated]

This function is deprecated, as it is deemed as too specific for admiral. Derivations like this can be implemented calling mutate() and case_when().

Derives the variable ATIREL to CONCOMITANT, PRIOR, PRIOR_CONCOMITANT or NULL based on the relationship of cm Analysis start/end date/times to treatment start date/time

Usage

derive_var_atirel(dataset, flag_var, new_var)

Arguments

dataset

Input dataset The variables TRTSDTM, ASTDTM, AENDTM are expected

flag_var

Name of the variable with Analysis Start Date Imputation Flag

new_var

Name of variable to create

Value

A dataset containing all observations and variables of the input dataset and additionally the variable specified by the new_var parameter.

Details

ATIREL is set to:

  • null, if Datetime of First Exposure to Treatment is missing,

  • "CONCOMITANT", if the Analysis Start Date/Time is greater than or equal to Datetime of First Exposure to Treatment,

  • "PRIOR", if the Analysis End Date/Time is not missing and less than the Datetime of First Exposure to Treatment,

  • "CONCOMITANT" if the date part of Analysis Start Date/Time is equal to the date part of Datetime of First Exposure to Treatment and the Analysis Start Time Imputation Flag is 'H' or 'M',

  • otherwise it is set to "PRIOR_CONCOMITANT".

Author

Teckla Akinyi