A new telephone survey experiment finds that, despite major structural differences, an opinion poll drawn from a commercial voter file can produce results similar to those from a sample based on ...
Note: This report was updated on Dec. 30, 2015 to reflect the January-July 2015 National Health Interview Survey estimates released on December 1, 2015. Telephone surveys face numerous challenges, but ...
Aqua Survey, Inc. (ASI) is a full service ecotoxicology company founded in 1975. Aqua Survey provides laboratory testing, field sampling, geophysical surveying and consulting services to a wide ...
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