b<-dosresmeta(formula = adjrr ~ dose, type = study, id = id, se=se, cases=case, n = n, data = a, method = "fixed")
Error in diag(cov[-1] + cov[1]) :
error in evaluating the argument 'x' in selecting a method for function 'diag': Error in cov[-1] : object of type 'closure' is not subsettable
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