# pooltest

From plm v2.2-5
by Yves Croissant

##### Test of Poolability

A Chow test for the poolability of the data.

- Keywords
- htest

##### Usage

`pooltest(x, ...)`# S3 method for plm
pooltest(x, z, ...)

# S3 method for formula
pooltest(x, data, ...)

##### Arguments

- x
an object of class

`"plm"`

for the plm method; an object of class`"formula"`

for the formula interface,- …
further arguments passed to plm.

- z
an object of class

`"pvcm"`

obtained with`model="within"`

,- data
a

`data.frame`

,

##### Details

`pooltest`

is a *F* test of stability (or Chow test) for the
coefficients of a panel model. For argument `x`

, the estimated
`plm`

object should be a `"pooling"`

model or a `"within"`

model
(the default); intercepts are assumed to be identical in the first
case and different in the second case.

##### Value

An object of class `"htest"`

.

##### Examples

```
# NOT RUN {
data("Gasoline", package = "plm")
form <- lgaspcar ~ lincomep + lrpmg + lcarpcap
gasw <- plm(form, data = Gasoline, model = "within")
gasp <- plm(form, data = Gasoline, model = "pooling")
gasnp <- pvcm(form, data = Gasoline, model = "within")
pooltest(gasw, gasnp)
pooltest(gasp, gasnp)
pooltest(form, data = Gasoline, effect = "individual", model = "within")
pooltest(form, data = Gasoline, effect = "individual", model = "pooling")
# }
```

*Documentation reproduced from package plm, version 2.2-5, License: GPL (>= 2)*

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