plm (version 0.1-1)

pdimcheck: Check for the dimensions of the panel

Description

This function check the number of individuals and time observations in the panel and wheter it is balanced or not.

Usage

pdimcheck(id,time,data=NULL)

Arguments

id

a vector containing the individual index,

time

a vector containing the time index,

data

an optional data.frame.

Value

• a list containing the following elements :
• nT
  a list containing n, the number of individuals, T, the number of time observations, N the total number of observations,
• TinT
  a list containing two vectors : Ti gives the number of observations for each individuals and nt gives the number of individuals observed for each period,
• balanced
  a logical value : TRUE for a balanced panel, FALSE for an unbalanced panel,
• panel.names
  a list of character vectors : id.names contains the names of each individual and time.names contains the names of each period.

Details

pdimcheck is called by pdata.frame and by plm in there are some missing values.

See Also

pdata.frame and plm

Examples

library(Ecdat)
data(Produc)
pdimcheck(state,year,Produc)
pdimcheck(Produc$state,Produc$year)