Exit polls are surveys of a small percentage of voters taken after they leave their voting place. Pollsters use this data to project how all voters or segments of voters side on a particular race or ballot measure.
Formerly a publication of the U.S. Census Bureau and now published by ProQuest, contains a "comprehensive summary of statistics on the social, political, and economic organization of the United States.
IHME's (Institute for Health Metrics and Evaluation) catalog of the world's health and demographic data. Use the GHDx to research population census data, surveys, registries, indicators and estimates, administrative health data, and financial data related to health.
provides access to over 50 datasets on priority health topics including mortality and burden of diseases, the Millennium Development Goals (child nutrition, child health, maternal and reproductive health, immunization, HIV/AIDS, tuberculosis, malaria, neglected diseases, water and sanitation), non communicable diseases and risk factors, epidemic-prone diseases, health systems, environmental health, violence and injuries, equity among others.
In addition, the GHO provides on-line access to WHO's annual summary of health-related data for its 193 Member states: the World Health Statistics 2011.
An online course from the National Library of Medicine which "describes the range of available health statistics, identifies their sources and helps you understand how to use information about their structure as you search."