The National Highway Traffic Safety Administration plans to continue gathering data ... The collection of information consists of an informed consent for participation, a demographic questionnaire ...

Background Prospective data collection is recommended ... Objective To explore how sports injury epidemiological outcomes vary depending on the response rates to a weekly online self-reported ...

In six courses, you will learn the basics of questionnaire design, data collection methods, sampling design, dealing with missing values, making estimates, combining data from different sources ...