compress: Compresses a dataframe to make more efficient use of...

In rEHR: Manipulating and Analysing Electronic Health Record Data

Description

Converts date variables in a dataframe to integers Integers represent time in days from the supplied origin Converts specified numeric values to integer This function is useful for keeping file sizes down and is used by the to_stata command to save to Stata files.

Usage

compress(dat, origin = "1970-01-01", format = "%Y-%m-%d",
  date_fields = c("eventdate", "sysdate", "lcd", "uts", "frd", "crd", "tod",
  "deathdate"), integer_fields = c("yob", "practid"))

Arguments

dat	a dataframe
origin	ISO string representation of the dat of origin. default is UNIX start date
format	character: format of the date string. Default is ISO standard
date_fields	character vector of column names representing dates
integer_fields	character vector of column names that should be integers

Value

dataframe

rEHR documentation built on Jan. 23, 2017, 1 p.m.