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Dear All, I have a database of 200 observations named myD. In the dataframe there are a column named code (with codes varying from 1 to 77), a column named "prevalence" with some quantitative measurements are given and an column named Pr_mean, with no values. I would like to set a cycle to compute the average of prevalence values for each different code and store the averages under the

...e a random diameter. The problem I have is that I cannot use a matrix because the length of the three items is different. I was trying with list but I have no clue on how to make a dataset out of them... tried "merge".... Anyone has some clever suggestion? THANK you !! Giovanna Giovanna Ottaviani Aalmo Stipendiat/Ph.D. Student ------------------------------------------- Norsk institutt for skog og landskap Pb 115, NO-1431 Ås T (+47) 64 94 9094 M(+47) 980 30 422 F(+47) 64 94 90 80 ------------------------------------------- www.skogoglandskap.no<http://www.skogoglandskap.no/> --------...

Hello everybody, Anyone familiar with the package frontier? I have some general questions on how to approach the model design. Thanks in advance Giovanna Giovanna Ottaviani Aalmo Stipendiat/Ph.D. Student ------------------------------------------- Norsk institutt for skog og landskap Pb 115, NO-1431 Ås T (+47) 64 94 9094 M(+47) 980 30 422 F(+47) 64 94 90 80 ------------------------------------------- www.skogoglandskap.no<http://www.skogoglandskap.no/> --------...

...struggling to figure it out. The concept of mixed models is clear in my head but it is hard to present it. How should I then plot the learning curve? I have been plotting the data I have adding a smooth line. Is this good enough? Looking forward for your response Best regards Giovanna Giovanna Ottaviani Aalmo Stipendiat/Ph..D. Student ------------------------------------------- Norsk institutt for skog og landskap Pb 115, NO-1431 Ås T (+47) 64 94 9094 M(+47) 980 30 422 F(+47) 64 94 90 80 ------------------------------------------- www.skogoglandskap.no<http://www.skogoglandskap.no/> -------...