.compute_tau_: Compute tau2
Usage
.compute_tau_(x1, x2, x3, xuni, x4, x5)
Arguments
x1
the effect size g in the unsplit leaves
x2
the sampling variance vi in the unsplit leaves
x3
the lable of the unsplit leaves
xuni
the unique labels in the unsplit leaves
x4
the sorted effect size in the parent leaf
x5
the sorted sampling variance in the parent leaf