Dear users: Has anyone tried using splm to estimate a fixed effects model with one or more time-invariant variables? I may have missed something in the manual, but there isn't a clear way to switch to estimators (e.g. first difference) suited for data like that in splm. My colleagues and I are very interested to include splm in the analysis because spatial models in other mainstream programs do not support temporal variance. Best regards, K Chan [[alternative HTML version deleted]]