[R] Plm on splitted data

[goyalprtk]

Hi all

I want to use plm function on splitted dataset but facing problems while
doing it.

I did the same for lm function it worked fine but now my problem forces me
to use lags into it while in a single set I have multiple type of data,
which I believe can only be done with panel data.

The code I am using is

A = split(mydata, mydata$Unique.ID.Number)
Z = lapply(A, function(df){plm(Total.Sales ~ Purchase.Score, data = df)})

It is showing this error

Error in eval(expr, envir, enclos) : object 'Total.Sales' not found

This works when we try 

Z = lapply(A, function(df){lm(Total.Sales ~ Purchase.Score, data = df)})


Thanks in advance



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