Potential biases are associated with non-response, incomplete interviews, missing values and convenience bias (some potential respondents may not have been included because they do not have a landline and cell phone). It is based on a large stratified random sample. The sample data should allow us to generalize to the population of interest. The dataset we are working on contains 330 variables for a total of 491, 775 observations in 2013. Disproportionate stratified sampling (DSS) has been used for the landline sample and the cellular telephone respondents are randomly selected with each having equal probability of selection. The data were collected from United States’ all 50 states, the District of Columbia, Puerto Rico, Guam and American Samoa, Federated States of Micronesia, and Palau, by conducting both landline telephone and cellular telephone-based surveys. Data Collection:ĭata collection procedure is explained in brfss_codebook. For example, respondents are asked about their diet and weekly physical activity, their HIV/AIDS status, possible tobacco use, immunization, health status, healthy days - health-related quality of life, health care access, inadequate sleep, hypertension awareness, cholesterol awareness, chronic health conditions, alcohol consumption, fruits and vegetables consumption, arthritis burden, and seatbelt use. The BRFSS is designed to identify risk factors in the adult population and report emerging trends. The Behavioral Risk Factor Surveillance System (BRFSS) is an annual telephone survey in the United States. Load packages library ( ggplot2 ) library ( dplyr ) library ( Hmisc ) library ( corrplot ) Load data load ( "brfss2013.RData" ) Part 1: About the Data
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