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...Bb 22.97658 Bc 39.45485 Thank you in advance for any suggestion. Stefano -- ====================================================================== Stefano Leonardi Dipartimento di Scienze Ambientali Universita` di Parma stefano.leonardi at unipr.it Viale Usberti 11a Phone : +39-0521-905659 43100 PARMA (Italy) Fax : +39-0521-905402

Dear R-list, I have a statistical problem with the comparison of short time-series, representing densities of fish in different streams. For each stream (6 in total, here below showed only part of the dataset) I have 8 years of density data, as follows: year density stream 1 2000 0.51 stream1 2 2001 0.87 stream1 3 2002 0.68 stream1 4 2003 0.56 stream1 5 2004 0.50 stream1 6