This message has been cross posted to the following eGroups: Statistical Consulting Section and ASA Connect .
-------------------------------------------
-------------------------------------------
Rose Hart
Recent Graduate
-------------------------------------------
I would like to do a meta-analysis to find an over-all expected yield for switchgrass when no nitrogen is applied and a meta-regression for yield with the co-variate applied nitrogen rates. A few studies give an estimate of expected yield when no nitrogen is applied. Most studies give both an estimate of expected yield when no nitrogen is applied and and estimates when different rates of nitrogen are applied.
The meta-analysis references I've found so far use within-study differences to estimate an effect size and use regression to help explain the estimated between-study variance using a covariate, a covariate not used to estimate effect size.
Please point me to a reference that instructs on how to perform a meta-analysis to find a mean expected yield and then do regression with nitrogen as the covariate. I am assuming this is possible!
Thank you,
Rose Hart