Dear all, I am trying to fit a simple (intercept-only) meta-analytic model using the robumeta package using the following code: anx_cont_mean<-robu(formula = es_fisher ~ 1, var.eff.size = variance_fisher, studynum = study_ID, modelweights = "CORR", rho = 0.8, small=TRUE, data = anxiety_control)
When I try to run this model, the following error message pops up: Error in solve.default(sumXWX) : system is computationally singular: reciprocal condition number = 0 What exactly does this mean in the context of meta-analysis? I haven't been able to find any answers. Thank you, Kristina ----------------------------------------- Kristina Loderer Ludwig-Maximilians-Universität München Department Psychologie Leopoldstr. 13 D-80802 München Telefon: +49 (89) 2180-6047 Email: kristina.lode...@psy.lmu.de ----------------------------------------- ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
