plm (version 0.1-2)

between: The between transformation

Description

Computes the between transformation

Usage

Between(x, ...)
## S3 method for class 'pserie':
Between(x,effect="individual", ...)
## S3 method for class 'matrix':
Between(x,cond, ...)
## S3 method for class 'default':
Between(x,cond, ...)
between(x, ...)
## S3 method for class 'pserie':
between(x,effect="individual", ...)
## S3 method for class 'matrix':
between(x,cond, ...)
## S3 method for class 'default':
between(x,cond, ...)

Arguments

x

a numeric vector or matrix,

cond

a vector containing the conditional variable,

effect

the effect for the Between transformation (one of individual and time),

...

further arguments.

Value

• a vector (or a matrix) of the same length as x containing the between transformation (Between) or of a length equal of the number of modalities of the conditional variable (between). NA values are inserted at the correct positions

See Also

within and papply.

Examples

library(Ecdat)
data(Grunfeld)
pdata.frame(Grunfeld,"firm","year")
Bi <- Between(Grunfeld$inv)
X <- model.matrix(~value+capital-1,Grunfeld)
BX <- Between(X,Grunfeld$firm)
bi <- between(Grunfeld$inv)
bX <- between(X,Grunfeld$firm)
# computes the between estimator with the lm command
blm <- lm(between(inv)~between(value)+between(capital),data=Grunfeld)