"For years, the Current Population Survey conducted by the U.S. Census Bureau overestimated the number of people without health insurance. Last year, the Census Bureau revised the survey to correct the error, which was likely caused by the way the government asked Americans about their coverage. The fix ... should produce more-accurate estimates. But responses obtained with the new methodology aren't compatible with responses collected using the previous approach, making it harder to examine uninsured rates over the years at a crucial moment -- as Americans try to gauge the success of the Affordable Care Act."  MORE >>