[R-sig-ME] hierarchical unbalanced design

Irene Mantzouni ima at difres.dk
Thu Nov 22 18:30:29 CET 2007

Hi all!
I have a mixed model with timeseries of y and x for populations:
I am wondering if I can make it hierarchical by adding a random effect for year:
However the design is unbalanced: the time-series have different lengths for each population although the time-periods are overlapping in general. 
Would it be meaningful to include the Year effect this way? 
Thank you!

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