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Comparison of 2 treatments
2 messages · Hamada Elsayed Ali, Ben Bolker
On 14-04-30 05:44 AM, Hamada Elsayed Ali wrote:
Dear All,
I'd like for your help as I have a sediment data collected before, within and after the field margin and my data looks like that:
Site sediment position management slope 1 15.20 before managed steep 1 10.10 within managed steep 1 11.20 after managed steep 2 14.20 before natural steep 2 12.10 within natural steep 2 13.20 after natural steep 3 8.20 before managed flat 3 11.10 within managed flat 3 14.20 after managed flat 4 16.20 before natural flat 4 12.10 within natural flat 4 10.20 after natural flat
I'd like to compare the sediment before and after in the management and slope and to know how much the sediment reduction or the increasing in the different treatments. Can anybody help me in such a question. Thanks,
Is this all of your data or a subset? What have you tried? Have you read any literature on mixed models (e.g. Pinheiro and Bates's 2000 book, or Gelman and Hill 2008, or one of Zuur et al's books)? Do you know/can you express what model you would fit if there were no random effects involved? Ben Bolker