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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