[R] robumeta package - error

Kristina Loderer
Thu, 01 Sep 2016 16:52:16 -0000

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


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Kristina Loderer
Ludwig-Maximilians-Universit?t M?nchen
Department Psychologie
Leopoldstr. 13
D-80802 M?nchen

Telefon: +49 (89) 2180-6047
Email: Kristina.Loderer at psy.lmu.de

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