Fixed effects in R for a Stata user -


i've looked similar question haven't yet found i'm looking for.

in stata, can run model below panel data (school , time fixed effects):

xi: areg total i.year*group_dummy, absorb(school) cluster (school)

how run similar regression in r using plm package?

this tried:

model1 <- plm(total ~ group_dummy,            na.action = na.omit,           data   = pdlong,            method = "within",           index = c("school", "year"),           effect = "twoway")

but error message (and unsure how should interpreted):

error in x[, ii] : subscript out of bounds


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