These pre-defined dose frequencies are sourced from
CDISC. The
number of rows to generate using create_single_dose_dataset() arguments
start_date and end_date is derived from DOSE_COUNT, DOSE_WINDOW, and
CONVERSION_FACTOR with appropriate functions from lubridate.
Details
NCI_CODE and CDISC_VALUE are included from the CDISC source for
traceability.
DOSE_COUNT represents the number of doses received in one single unit of
DOSE_WINDOW. For example, for CDISC_VALUE=="10 DAYS PER MONTH",
DOSE_WINDOW=="MONTH" and DOSE_COUNT==10. Similarly, for
CDISC_VALUE=="EVERY 2 WEEKS", DOSE_WINDOW=="WEEK" and
DOSE_COUNT==0.5 (to yield one dose every two weeks).
CONVERSION_FACTOR is used to convert DOSE_WINDOW units "WEEK",
"MONTH", and "YEAR" to the unit "DAY".
For example, for CDISC_VALUE=="10 DAYS PER MONTH", CONVERSION_FACTOR
is 0.0329. One day of a month is assumed to be 1 / 30.4375 of a month (one
day is assumed to be 1/365.25 of a year).
Given only start_date and end_date in the aggregate dataset, CONVERSION_FACTOR
is used to calculate specific dates forstart_date and end_date in the
resulting single dose dataset for the doses that occur. In such cases, doses
are assumed to occur at evenly spaced increments over the interval.
To see the entire table in the console, run print(dose_freq_lookup).