Consider the OLS cluster-robust variance estimator formula (24.33). Suppose there are two levels of clustering. Specifically, in the context of the empirical example of this chapter, clustering could be at the level of family and commune if multiple members of the family from the same commune are included in the survey. How will the formula be modified if the data have two levels of clustering?

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A=plimN-LXX., c=1 B = plim N Xueuexes c=1 (24.33)