Description Usage Arguments Examples
Taken directly from rom https://github.com/matthieugomez/statar
1 2 3 |
x |
a vector of values |
n |
a positive integer of length 1, giving the number of positions to lead or lag by. When the package lubridate is loaded, it can be a period when using with time (see the lubridate function minutes, hours, days, weeks, months and years) |
time |
time variable |
default |
value used for non-existant rows. Defaults to |
1 2 3 4 5 6 7 8 9 10 11 12 13 | date <- c(1989, 1991, 1992)
value <- c(4.1, 4.5, 3.3)
tlag(value, 1, time = date) # returns value in year - 1
library(lubridate)
date <- as.monthly(mdy(c("01/04/1992", "03/15/1992", "04/03/1992")))
tlag(value, time = date)
library(dplyr)
df <- data_frame(
id = c(1, 2, 2),
date = date,
value = value
)
df %>% group_by(id) %>% mutate(valuel = tlag(value, n = 1, time = date))
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