findClosestToBaseline: Finds the measurement date that is closest to baseline

In smm52/timeBlocks: Converts Serial Measurement Data into Longitudinal Trajectory of Equally-sized Time Blocks

Finds the measurement date that is closest to baseline

Description

Finds the measurement date that is closest to baseline in the given time period around baseline.

Usage

findClosestToBaseline(
  serialDf,
  baselineDates,
  blDayDiff = 90,
  idColumn = "PATIENT",
  dateColumn = "VISIT",
  dataColumn = "MEASURE"
)

Arguments

idColumn	name of ID column: default is PATIENT
dateColumn	name of date column: default is VISIT. This column has to be of class Date
dataColumn	name of the data column: default is MEASURE
df	the data frame to check
dayDiff	time around baseline (default: 90 days, will look three months before and after baseline)

Value

data frame with baseline measure or NA if no measurement was close to baseline

Examples

## Not run: 
baselinePatients <- read_tsv('../data/ourBaselinePatients.txt', guess_max = 3582) %>%
    select(PATIENT, VISIT = VISIT_TL)
bmi <- read_tsv('../data/serial_bmi.txt') # contains serial and baseline data
baselinePatients <- findClosestToBaseline(bmi, baselinePatients, blDayDiff = 90)

## End(Not run)

smm52/timeBlocks documentation built on Nov. 27, 2022, 3:54 a.m.