Where to find I2 calculations?

[verweijs]

Dear Gert,

Where in the code can I find the calculations for the heterogeneity (tau and I2)?

I can see that the summary of mtc.run() provides the I^2, but cannot find in which script it is calculated, and cannot find where it is called in mtc.run.R. My heterogeneity levels seem suspiciously low (below 10%) for what I expected to be quite heterogeneous Poisson rate data.

Best,
Stefan