Ask a Question

We especially welcome questions that are likely to be of interest to other readers. The econometric universe is infinite and expanding, so we ask that questions be brief and relate to material in the book. Here is an example:

“In Section 8.2.3, (on page 319), you suggest that 42 clusters is enough for the usual cluster variance formula to be fairly accurate. Is that a joke, or do you really think so?”
To which we’d reply: “Yes.”

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