locf: Last Observation Carried Forward (LOCF)

In qPharmetra/qpToolkit: qPharmetra R Tools

Last Observation Carried Forward (LOCF)

Description

Derive Last Observation Carried Forward (LOCF). Preserves factors as well.

Usage

locf(x, na = NA)

Arguments

x	Placehoder for parameter description
na	code for missing values to be LOCF-ed

Value

Placeholder for return description

Examples

locf(c(NA,NA,1,NA,NA,2,NA,NA,NA,NA,3))
# Note that initial missing values take next value (1),
# so next value carried backward at beginning
# Example with "."
locf(c(".",".",1,".",".",2,".",".",".",".",3), na = ".")
# Note, if you have text in the vector, it is all converted to text.
# This is by design so we can use different types.
# Examples with factors
fac = as.factor(c(".",".","A",".",".","B",".",".",".",".","C"))
locf(fac,na = ".")
fac = as.factor(c(NA,NA,"A",NA,NA,"B",NA,NA,NA,NA,"C"))
locf(fac,na = NA)

qPharmetra/qpToolkit documentation built on May 24, 2023, 8:52 a.m.