SciencesPo (version 0.11.21)

shift: Lag and Lead Observations

Description

Shift function allows one to either lag or lead a column variables in a data frame.

Usage

shift(x, delta=NA)

Arguments

x

is a variable to be lagged or leaded.

delta

an integer value as positive (#) or negative (-#).

Value

• An object of the same type as x.

encoding

UTF-8

Examples

weather <- data.frame(
month = a <- c('J','F','M','A','M','J','J','A','S','O','N','D'),
precip = b <- c(78,62,74,78,76, 83, 91, 93, 93,78, 93, 81), 
max = c <- c(-6, -4, 2, 11, 19, 24,  26,  25, 20, 13, 5, -2),
min = d <- c(-15, -13, -7, 1, 8,  13, 16, 14, 9, 3, -2, -10) )

(weather$L.precip <- shift(weather$precip, -1) )

(weather$precip.L <- shift(weather$precip, 1) )