Dear all, 

i just wonder  if there´s a way to use a two column time index field in plm package. 

the manual says the following concerning data indexing: 

a character vector of length two containing the names of the individual and the time
index,

What would y´all do with a quarterly dataset that contains one column for the period and one for the year. Do I have to convert it to one single date field first ?


thx in advance

matt
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