PPT-Does Undercoverage on the US Address-based Sampling Frame Translate to Coverage Bias?

Ashley Amaya Stephanie Zimmer Katherine Morton and Rachel Harter July 20 2017 ESRA 2017 1 The ABS Frame US Postal Systems Computerized Delivery Sequence File CDS Contains all addresses for which USPS delivers mail. So sampling bias is consistent error that arises due to the sample selection For example a survey of high school students to measure teenage use of illegal drugs will be a biased sample because it does not include home schooled students or dropouts Cautions about Sampling. Special Topics. Undercoverage. Sample surveys of large human . populations require . more than a good sampling design. .. We . need an accurate and complete list of the population. Because such a list is rarely available, most samples suffer from some degree . Merits, Design, and Implementation. Mansour Fahimi, Ph.D.. VP, Statistical Research Services. National Conference on Health Statistics. National Center for Health Statistics (NCHS) . August 16 - 18, 2010. Choosing your participants for your research.. Sample. The group of participants that make up your research. Samples are supposed to represent the . population . that you are researching but the way you choose to find your sample is dependent on many factors.. by:. Rosalinda M. Garcia, . Bureau of Agricultural Statistics. Minerva Eloisa. P. . Esquivias. , National Statistics Office. Regional Workshop on Sampling. for Agricultural Censuses and Surveys. Researchers studied the effects that improving vision with eyeglasses had on educational outcomes. They identified 2,069 students who could improve their vision with eyeglasses. 750 were not offered eyeglasses and 1,319 were. Of the 1,319 offered eyeglasses, 928 accepted the eyeglasses. Students who received the eyeglasses scored significantly higher in both math and science. What was the treatment in this study?. . based. Probabilistic. Motion . Planning. T. Siméon, J.P. Laumond, C. . Nissoux. ,. Visibility. . based. . probabilistic. . roadmaps. for motion planning. Advanced . Robotics. Journa. l, Vol. 14, N°6, 2000. How do Sociologists choose the participants for their research?. Starter. Think. - Work independently for 2 minutes to write in as many key concepts into the worksheet as you can. . Pair. - Now, work in a pair with the person sitting next to you for 2 minutes and help each other with any key concepts you couldn't do on your own.. FOR . AGRICULTURAL STATISTICS. Module 2 - Session . 5:. Using . a Multiple Sampling Frame as an MSF. Objectives of the presentation. Review the . principles of multiple frame . sampling. Deal . with . Biased or Unbiased. What is bias?. In survey sampling, bias refers to the tendency of a sample statistic to systematically . over- or under-estimate. a population parameter.. Bias due to unrepresentative samples. Merits, Design, and Implementation. Mansour Fahimi, Ph.D.. VP, Statistical Research Services. National Conference on Health Statistics. National Center for Health Statistics (NCHS) . August 16 - 18, 2010. Background. We have learned ways to display, describe, and summarize data, but have been limited to examining the particular batch of data we have.. To make decisions, we need to go beyond the data at hand and to the world at large.. Sampling. Rachel Harter, Chair. Overview of Session. Introduction and Background. Scripted Q&A with Panelists. Open Q&A Floor Discussion. 2. What is ABS?. In broad terms, ABS (address-based sampling) refers to survey methodologies for samples selected from . Ashley Amaya, Matthew Williams, Devon Cribb, Rachel Harter, & Katherine Morton. August 2, 2018. JSM 2018. 1. Acknowledgements. The presentation is sponsored by RTI International’s Survey Research Division, with the research included in the presentation stemming from ongoing methodological work conducted under the contract for the .