Statistical Analysis Documents for ACE3 Indicators
Statistical Methods Documents
The statistical methods memoranda below are referred to in the Methods descriptions for many of the ACE3 indicators. Two of the memoranda present statistical methods used for the analyses of Biomonitoring and Health indicators that are derived from the National Health and Nutrition Examination Survey (NHANES), the National Health Interview Survey (NHIS), and other surveys. The third memorandum focuses on the air indicators in the Environments and Contaminants section, which are based on trends in annual summary statistics that are not derived from survey data.
The statistical methods are used to inform which observed trends and demographic differences in ACE3 indicators are large enough to be highlighted in discussions about the findings rather than being attributed to random variation.
- Statistical Comparisons for NHIS-NHANES. Cohen, J. 2010. Selected statistical methods for testing for trends and comparing years or demographic groups in ACE NHIS and NHANES indicators. Memorandum submitted to EPA, 21 March, 2010 (pdf) : This memorandum describes various statistical methods for testing for trends, analyzing year-to-year changes, and comparing demographic groups in the values of the ACE3 prevalence and biomonitoring indicators that use data from NHIS and NHANES.
- Statistical Comparisons for Other Health Indicators. Cohen, J. 2011. Selected statistical methods for testing for trends and comparing years or demographic groups in other ACE health-based indicators. Memorandum submitted to EPA, 16 June, 2011 (pdf) : This memorandum describes various statistical methods for testing for trends, analyzing year-to-year changes, and comparing demographic groups in the values of the ACE3 indicators that use data from the National Hospital Ambulatory Medical Care Survey (NHAMCS), the National Hospital Discharge Survey (NHDS), the Surveillance, Epidemiology, and End Results (SEER) national cancer data, and the adverse birth outcomes indicators that use data from the National Vital Statistics System (NVSS) , as well as the obesity indicators that use data from NHANES.
- Statistical Comparisons for Air Indicators. Cohen, J. 2011. Statistical methods for testing for trends and year-to-year changes to air quality measures. Memorandum submitted to EPA, November 2010 (pdf) : This memorandum describes statistical methods for testing for trends and year-to-year changes in the ACE3 air quality indicators, and in other ACE3 indicators defined as annual summary statistics.
Standard Error (SE) Tables
These tables, available as Microsoft Excel files, provide additional statistical data for all Biomonitoring indicators; the Respiratory Diseases, Childhood Cancer, Neurodevelopmental Disorders, and Obesity indicators in the Health section; and the Indoor Environments indicators in the Environments and Contaminants section of ACE3. The tables provide standard errors, relative standard errors, sample sizes, and other data.