Hey,
I just have trouble adding a object specific time trend with the
plm-package. I recieve the following error:
*
**"Error in model.frame.default(terms(formula, lhs = lhs, rhs = rhs,
data = data, : invalid type for the variable 'time' "*
I used the formula:
/ FE_trend<- plm(log(revenue) ~ log(supply)+ city*time,
data=R_Test_log_Neu, model="within", effect = "twoways") //
/
Do you have an idea how to fix it?
Toby
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