Yesterday, Louise Sheiner presented a paper at Brookings that challenges some of the the interpretations of Dartmouth research on geographic variation in health care. Her work suggests that patient, not provider, factors explain most of geographic (in her case, state) variation in spending. Coincidentally, I had already prepared a post reviewing work that comes to the opposite conclusion. It is not intended as a rebuttal to Sheiner’s work. You’ll find the post on the AcademyHealth blog.