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...but that should be easy to understand. "Errore" means, of course, error and "sconosciuto" means unknown. Basically the package cannot be loaded because there is an unknowwn item (at least, that's what I understand). Does anybody have an idea of the problem? Thank you, Giangiacomo

...F] : numero di dimensioni errato which means that the number of dimensions is wrong in X.m[, coef.within, drop = F]. However, I have no problem to estimate a more complex model, e.g. > zz <- plm(y ~ 1 + x + I(x^2), data=mydata) in this case everything is ok. What's wrong? Thank you, Giangiacomo

...doesn''t. Why? I didn''t want to report this because I thought it was just a matter of time before this would have been solved, but in the end I decided to post here, at least to try to understand if it''s just me who''s unable to understand how to solve this. -- Giangiacomo -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html