r - Panel data models: Duplicate couples error when there are no duplicate couples -


i have panel data set individual (dyad_id), integer, , time (year_month) date variable. try running following code:

df.fe <- plm(deaths_civilians ~ deaths_a_lag + deaths_b_lag,                           data = rebel,                           index = c("dyad_id", "year_month"),                           model = "within",                           effect = "individual")

but keep getting following error message: 

error in pdim.default(index[[1]], index[[2]]) :    duplicate couples (id-time) in addition: warning messages: 1: in pdata.frame(data, index) :   duplicate couples (id-time) in resulting pdata.frame  find out which, use e.g. table(index(your_pdataframe), usena = "ifany") 2: in is.pbalanced.default(index[[1]], index[[2]]) :   duplicate couples (id-time)  3: in is.pbalanced.default(index[[1]], index[[2]]) :   duplicate couples (id-time)

all previous answers question because have more 1 observation same id same time period, have checked , not case. have tried transforming both id , year_month different types of variables (factors, integers etc) nothing works.

i cannot provide reproducible data diagnose problem because final dataset result of merging 6 separate datasets, , 300 lines of code. however, able suggest potential reason problem , remedies?


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