Xtset Stata Example. If for example one country does not have data for one year then the data is unbalanced. Xtreg xtlogit xtpoisson etc.
A duplicates command found 0 observations. Below is an example of an autoregressive 1 covariance matrix. In addition to the covariance structures shown above stata also offers the following covariance structures.
Xtset country year in this case country represents the entities or panels i and year represents the time variable t.
The storage types of both panelvar and timevar must be numeric and both variables must contain integers only. Below is an example of an autoregressive 1 covariance matrix. Xtset panelvar xtset panelvar timevar. Some other commands like clogit can also sometimes be used.
