Ulrich,
as usual with such specific questions, it is a good idea to have the
package authors at least Cc (done now). In April I had already forwarded
your message privately to the plm authors with the following comment:
I've quickly checked what is going on. If you do something like
foo <
Dear "plm"-Package insiders,
[I posted the following observation is April already but unfortunately I am not
aware of any answers.
With the hope that someone found an answer in the mean time, I ask again:]
I realized the following difficulty with the summary.plm function (demonstrated
wit
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