1 | Baltagi, B., Econometric Analysis of Panel Data, 2nd ed. Wiley, 2005. |
2 | Wooldridge, J. Econometric Analysis of Cross-Section and Panel Data, MIT Press, 2001. |
3 | Hsiao, C., Analysis of Panel Data, 2nd ed., Cambridge University Press, 2003. |
4 | Stata Longitudinal Panel Data, Release 10. |