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Derive Analysis Study Day

Source: R/derive_var_ady.R
derive_var_ady.Rd

[Deprecated]

This function is deprecated, please use derive_vars_dy() instead.

Adds the analysis study day (ADY) to the dataset, i.e., study day of analysis date.

Usage

derive_var_ady(dataset, reference_date = TRTSDT, date = ADT)

Arguments

dataset

Input dataset

The columns specified by the reference_date and the date parameter are expected.

reference_date

The start date column, e.g., date of first treatment

A date or date-time object column is expected.

Refer to derive_vars_dt() to impute and derive a date from a date character vector to a date object.

The default is TRTSDT.

date

The end date column for which the study day should be derived

A date or date-time object column is expected.

Refer to derive_vars_dt() to impute and derive a date from a date character vector to a date object.

The default is ADT

Value

The input dataset with ADY column added

Details

The study day is derived as number of days from the start date to the end date. If it is non-negative, one is added. I.e., the study day of the start date is 1.

Author

Stefan Bundfuss