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Thread: Site, treatment,numbers before and after

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    Site, treatment,numbers before and after




    Hi

    I have data from an environmental experiment. We treated a section of river bed to remove an invasive species. I could do with some help deciding on what test to use in picking through the data as i have spent most of my time working in the field and stats are a bit challenging for me.

    My data is not normal so I have log transformed it.

    I have 3 sites and 3 treatment methods. Each method was used at each site once. I have numbers of individuals before and after for each site and treatment type.

    I would like to see if the treatments were successful at reducing numbers and which treatment was best.

    Can any one help?

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    Re: Site, treatment,numbers before and after

    Is there anything special about each of the three sites?
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    Re: Site, treatment,numbers before and after

    Hi hlsmith

    Site one is a low density site, two is medium density and three is high density.

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    Re: Site, treatment,numbers before and after


    So your first step is to define all of your potential variables. What is the dependent variable (the one that gets influenced or predicted [your outcome of interest], is it categorical or continuous. Then what are your independent variables (the ones that will predict or influence the dependent), are they categorical or continous. Lastly are there any variables that you want to control for, how are they formatted? It helps to write out the research aim and hypothesis.

    Answer these questions then you will be most of the way there.
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