I have reported on health for most of my career. My work as an investigative reporter at the Los Angeles Times and the Orange County Register exposed problems with the fertility industry, the trade in human body parts and the use of illegal drugs in sports. I helped create a first-of-its-kind report card judging hospitals on a wide array of measures for a story that was a finalist for the Pulitzer Prize. I was one of the lead reporters on a series of stories about lead in candy, a series that also was a finalist for the Pulitzer.For the Center for Health Journalism (previously known as Reporting on Health), I have written about investigative health reporting and occasionally broke news on my column, Antidote. I also was the project editor on the Just One Breath collaborative reporting series.  These days, for the University of Washington, I now work as the Executive Director for Insitutue for Health Metrics and Evaluation's Client Services, a social enterprise. You can follow me on Twitter @wheisel.

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Know Your Source: Where Do Health Data Originate?

Over a series of posts, I’m going to try to break down some of the broad categories of data, discuss how they are used and point out some of their limitations. I’m going to cover four main areas: vital statistics, censuses, surveys, and estimates.