Last Observation Carried Forward

Description

Generic function for replacing each NA with the most recent non-NA prior to it.

Usage

na.locf(object, na.rm = TRUE, ...)

Arguments

Value

An object in which each NA in the input object is replaced by the most recent non-NA prior to it. If there are no earlier non-NAs then the NA is omitted (if na.rm = TRUE) or it is not replaced (if na.rm = FALSE).

See Also

zoo

Examples

az <- zoo(1:6)

bz <- zoo(c(2,NA,1,4,5,2))
na.locf(bz)

cz <- zoo(c(NA,9,3,2,3,2))
na.locf(cz)

# Apply na.locf to independent variables but not reponse

lm(I(lag(az) ~ na.locf(bz) + diff(na.locf(cz))))