Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/130487
Authors: 
Klaassen, Franc
Teulings, Rutger
Year of Publication: 
2015
Series/Report no.: 
Tinbergen Institute Discussion Paper 15-137/VI
Abstract: 
Fixed effects (FE) in panel data models overlap each other and prohibit the identification of the impact of ''constant'' regressors. Think of regressors that are constant across countries in a country-time panel with time FE. The traditional approach is to drop some FE and constant regressors by normalizing their impact to zero. We introduce ''untangling normalization'', meaning that we orthogonalize the FE and, if present, the constant regressors. The untangled FE are much easier to interpret. Moreover, the impact of constant regressors can now be estimated, and the untangled FE indicate to what extent the estimates reflect the true value. Our untangled estimates are a linear transformation of the traditional, zero-normalized estimates; no new estimation is needed. We apply the approach to a gravity model for OECD countries' exports to the US. The constant regressors US GDP, world GDP and the US effective exchange rate explain 90% of the time FE, making the latter redundant, so the estimated impacts indeed reflect the true value.
Subjects: 
gravity model
fixed effects
multicollinearity
normalization
orthogonalization
JEL: 
C18
C23
F14
Document Type: 
Working Paper

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