# Lag

From Hmisc v4.0-3
by Frank E Harrell Jr

##### Lag a Numeric, Character, or Factor Vector

Shifts a vector `shift`

elements later. Character or factor
variables are padded with `""`

, numerics with `NA`

. The shift
may be negative.

- Keywords
- manip

##### Usage

`Lag(x, shift = 1)`

##### Arguments

- x
a vector

- shift
integer specifying the number of observations to be shifted to the right. Negative values imply shifts to the left.

##### Details

A.ttributes of the original object are carried along to the new lagged one.

##### Value

a vector like `x`

##### See Also

##### Examples

```
# NOT RUN {
Lag(1:5,2)
Lag(letters[1:4],2)
Lag(factor(letters[1:4]),-2)
# Find which observations are the first for a given subject
id <- c('a','a','b','b','b','c')
id != Lag(id)
!duplicated(id)
# }
```

*Documentation reproduced from package Hmisc, version 4.0-3, License: GPL (>= 2)*

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