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A quick query about standard errors.
I am extracting means, SE and sample sizes from a number of studies on the effects of invasive plant species on ecosystems.
Some studies present various measures of an ecosystem property (e.g. total aboveground biomass) at different time periods in both invaded and uninvaded systems. I would like to get an idea of general differences and am not interested in time as a factor. Obviously I can take the mean invaded and uninvaded ecosystem means to calculate a response ratio.
What would be the best way to calculate the new SE?
I am extracting means, SE and sample sizes from a number of studies on the effects of invasive plant species on ecosystems.
Some studies present various measures of an ecosystem property (e.g. total aboveground biomass) at different time periods in both invaded and uninvaded systems. I would like to get an idea of general differences and am not interested in time as a factor. Obviously I can take the mean invaded and uninvaded ecosystem means to calculate a response ratio.
What would be the best way to calculate the new SE?
Philip Martin It's alright. I think I have worked this out. You can use the pooled SD to calculate it.
15th February
Scott Chamberlain Right, that's what I have done too, Just calculate a pooled SD.
15th February
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Meta-analysis in Ecology and Evolutionary Biology. A group for the discussion of meta-analysis in the fields of ecology and evolution.
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