plm (version 1.4-0)

pFtest: F Test for Individual and/or Time Effects

Description

Test of individual and/or time effects based on the comparison of the within and the pooling model.

Usage

pFtest(x, ...)
## S3 method for class 'plm':
pFtest(x, z, ...)
## S3 method for class 'formula':
pFtest(x, data, ...)

Arguments

x

an object of class "plm" or of class "formula",

z

an object of class "plm",

data

a data.frame,

...

further arguments.

Value

• An object of class "htest".

Details

For the plm method, the argument of this function is two plm objects, the first being a within model, the second a pooling model. The effects tested are either individual, time or twoways, depending on the effects introduced in the model.

See Also

plmtest for Lagrange multipliers tests of individuals and/or time effects.

Examples

data("Grunfeld", package="plm")
gi <- plm(inv ~ value + capital, data = Grunfeld, model = "pooling")
gt <- plm(inv ~ value + capital, data = Grunfeld,
          effect = "time", model = "within")
gd <- plm(inv ~ value + capital, data = Grunfeld,
          effect = "twoways", model = "within")
pFtest(gt, gi)
pFtest(gd, gi)
pFtest(inv ~ value + capital, data = Grunfeld, effect = "twoways")