Abstract
This paper considers a panel data regression model with heteroskedastic as well as serially correlated disturbances, and derives a joint LM test for homoskedasticity and no first order serial correlation. The restricted model is the standard random individual error component model. It also derives a conditional LM test for homoskedasticity given serial correlation, as well as, a conditional LM test for no first order serial correlation given heteroskedasticity, all in the context of a random effects panel data model. Monte Carlo results show that these tests along with their likelihood ratio alternatives have good size and power under various forms of heteroskedasticity including exponential and quadratic functional forms.
Original language | English (US) |
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Pages (from-to) | 122-124 |
Number of pages | 3 |
Journal | Journal of Econometrics |
Volume | 154 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2010 |
Keywords
- Heteroskedasticity
- Lagrange multiplier tests
- Likelihood ratio
- Panel data
- Random effects
- Serial correlation
ASJC Scopus subject areas
- Economics and Econometrics