locf: Impute Missing Vector Values

Description Usage Arguments Value Functions Examples

Description

locf() implements 'last observation carried forward': NA's are imputed with the most recent non-NA value. nocb() is the complement: 'next observation carried backward': NA's are imputed with the next non-NA value. forbak() first executes locf(), then nocb(), so that even leading NAs are imputed. If even one non-NA value is present, forbak() should not return any NA's. bakfor() does the reverse.

Usage

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locf(x)

forbak(x)

bakfor(x)

nocb(x)

Arguments

x

a vector possibly with some missing values and some non-missing values

Value

a vector like x

Functions

Examples

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locf(c(NA,1,2,NA,NA,3,NA,4,NA))
nocb(c(NA,1,2,NA,NA,3,NA,4,NA))
forbak(c(NA,1,2,NA,NA,3,NA,4,NA))

bergsmat/nonmemica documentation built on Sept. 28, 2018, 4:11 p.m.