Via commenter AMac:
Tim Lambert has a new post that responds to some of Shannon’s arguments and takes me to task.
AMac himself posted this comment on Tim Lambert’s site, and I think summarizes well most of the important concerns about the Lancet piece. AMac is more cautious in his inferences than I would be, but I may be wrong and he may be right. He is generally thoughtful and fair-minded, and his contributions to the comment threads on this topic have been very helpful. I suspect that the data used in the Lancet study are of such low quality as to be of little practical use, but additional scrutiny of those data can’t hurt and should suggest ways in which future surveys could be improved.
UPDATE: AMac helpfully forwards some additional links in his comment below.
UPDATE 2: AMac provides this link to his latest and greatest post at WOC. Worth reading.