Coerce fixef to data frame in R (PLM package) -

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i'd fixed effects fixed effects panel data regression data frame. this:

data("produc", package = "plm") zz <- plm(log(gsp) ~ log(pcap) + log(pc) + log(emp) + unemp, data = produc, index = c("state","year")) view(as.data.frame(fixef(zz)))

unfortunately, last statement not work.

my expected output data frame state in first column , fixed effect in second.

i've googled, , come this: extract fixed effect , random effect in dataframe

unfortunately, answer not seem function.

this easy construct. first check kind of object fixef returns:

str(fixef(zz)) #class 'fixef'  atomic [1:48] 2.2 2.37 2.26 2.5 2.4 ... #  ..- attr(*, "se")= named num [1:48] 0.176 0.175 0.167 0.201 0.173 ... #  .. ..- attr(*, "names")= chr [1:48] "alabama" "arizona" "arkansas" "california" ... #  ..- attr(*, "type")= chr "level"

this tells fixef returns object of class 'fixef', @ core atomic vector of length 48. in addition class attribute there 3 attributes "se", "names" (which accessable names function) , "type".

then can this:

data.frame(state = names(fixef(zz)),            fixef = as.vector(fixef(zz))) #            state    fixef #1         alabama 2.201617 #2         arizona 2.368088 #3        arkansas 2.263016 # ...

as.vector necessary because data.frame tries coerce s3 object data.frame , there no corresponding method as.data.frame.


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