dd_sum: Calculate Cumulative Daily Dose
In amarshall1/prescribeR: Quantify Exposure Based On Routine Prescribing Data

Description Usage Arguments Value Examples

Calculates the cumulative number of daily doses of a drug of interest dispensed for each patient. Results can be limited to only patients who have been prescribed more than a desired threshold number of daily doses.

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dd_sum(df, drug, threshold = 1, patient_id_col = "patient_id",
  drug_id_col = "drug_id", presc_date_col = "presc_date_x",
  dd_disp_col = "dd_disp", date_format)

`df`	a data frame containing prescribing records to be analysed - records must contain at least a paitent ID, drug ID, a prescription date and the number of daily doses disepnsed
`drug`	a string containing a drug ID to be used to limit the prescribing data to the drug(s) of interest, accepts regular expressions
`threshold`	a number representing the minimum number of daily doses that must be present for the patient to be considered exposed
`patient_id_col`	a string, the name of the column in `df` containing the patient IDs
`drug_id_col`	a string, the name of the column in `df` containing the drug IDs
`presc_date_col`	a string, the name of the column in `df` containing the prescption date
`dd_disp_col`	a string, the name of the column in `df` containing the number of daily doses dispensed
`date_format`	a string, the format of the dates in `df`

a data frame containing patient IDs and the corresponding number of prescriptions, number of daily doses dispensed and the date of the first prescription of the drug of interest

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dd_sum(synth_presc, drug = "CITALOPRAM", threshold = 500,
drug_id_col = "approved_name", presc_date_col = "presc_date",
dd_disp_col = "ddd_dispensed", date_format = "%Y-%m-%d")