Pleae help in this issue.. I am conducting three-level meta-analytic models. when I am trying to determine the significance of heterogeneity in effect sizes it gives me this message:
random = list(~ 1 | id2,
~ 1 | id1),
tdist = TRUE,
data = HSV1)
Error in .ll.rma.mv(opt.res$par, reml = reml, Y = Y, M = V, A = A, X.fit = X, :
Final variance-covariance matrix not positive definite.
In addition: Warning messages:
1: In rma.mv(y, v, random = list(~1 | id2, ~1 | id1), sigma2 = c(0, :
There are outcomes with non-positive sampling variances.
2: In rma.mv(y, v, random = list(~1 | id2, ~1 | id1), sigma2 = c(0, : 'V' appears to be not positive definite.
How do i fix this issue?
Thank you for any help get