Based on https://www.annualreviews.org/doi/full/10.1146/annurev-statistics-022513-115540 VarMC=Variid/ess So ess=(SDposterior/SDMC)^2 SDMC/SDposterior of 5% gives ess=400
Based on
https://www.annualreviews.org/doi/full/10.1146/annurev-statistics-022513-115540
VarMC=Variid/ess
So ess=(SDposterior/SDMC)^2
SDMC/SDposterior of 5% gives ess=400