&amp; \rho\tau^2 &amp; \dots &amp; \rho\tau^2  \\
      \rho\tau^2 &amp; \tau^2 + \text{se}_2^2 &amp; \dots &amp; \rho\tau^2  \\
      \dots  &amp; \dots &amp; \dots &amp; \dots \\
      \rho\tau^2 &amp; \rho\tau^2 &amp; \dots &amp; \tau^2 + \text{se}_{J_k}^2 &amp; \\
  \end{bmatrix}.
\end{aligned}
</annotation></semantics></math> This specification corresponds to the
compound symmetry covariance matrix of random effects, the default
settings in the <code><a href="https://wviechtb.github.io/metafor/referenc