Secondary Data Analysis

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1 Slide 1 Secondary Data Analysis Young I. Cho University of Illinois Slide 2 What is secondary data? Data collected by a person or organization other than the users of the data 2 of 20 Slide 3 Advantages of Secondary Data Unobtrusive Fast & inexpensive Avoid data collection problems Provide bases for comparison 3 of 20

2 Slide 4 Disadvantages of Secondary Data Data availability Level of observation Quality of documentation Data quality control Outdated data 4 of 20 Slide 5 Data Sources Inter-university Consortium for Political and Social Research (ICPSR) National Center for Health Statistics (NCHS) Center for Medicare and Medicaid Services (CMS) US Census Bureau 5 of 20 Slide 6 Data Sources (cont( cont.) Examples of Directly Downloadable Data from NCHS: National Health and Nutrition Examination Survey (NHANES) National Ambulatory Medical Care Survey (NAMCS) National Hospital Ambulatory Medical Care Survey (NHAMCS) National Hospital Discharge Survey (NHDS) National Home and Hospice Care Survey (NHHCS) National Nursing Home Survey (NNHS) National Survey of Ambulatory Surgery (NSAS) National Employer Health Insurance Survey (NEHIS) National Vital Statistics System (NVSS) National Health Interview Survey (NHIS) 6 of 20

3 Slide 7 Data Sources (cont( cont.) Data Available for Use with Survey Documentation and Analysis (SDA): Aging Data Longitudinal Study of Aging, 70 Years and Older, National Survey of Self-Care and Aging: Follow-Up, 1994 National Health and Nutrition Examination Survey II: Mortality Study, 1992 National Hospital Discharge Survey, National Health Interview Survey, 1994, Second Supplement on Aging Criminal Justice Data International Crime Data Homicide Data National Crime Victimization Survey Data Corrections Data 7 of 20 Slide 8 Data Sources (cont( cont.) Data Available for Use with Survey Documentation and Analysis (continued): Substance Abuse Data Drug Abuse Warning Network Monitoring the Future National Household Survey on Drug Abuse National Pregnancy and Health Survey National Treatment Improvement Evaluation Study Treatment Episode Data Set Uniform Facility Data Set Washington, DC Metropolitan Area Drug Study (DC*MADS) 8 of 20 Slide 9 Evaluation of Data Sources Purpose of the study Sponsor/collector of the data Mode of data collection Sampling procedures Consistency of data with other sources 9 of 20

4 Slide 10 Evaluation of Data Sources (cont.) Documentation Number of observations Number of variables Coding scheme Summary statistics 10 of 20 Slide 11 Types of Survey Sample Design Simple Random Sampling Systematic Sampling Complex sample designs? stratified designs? cluster designs? mixed mode designs 11 of 20 Slide 12 Why complex survey design? Increased efficiency Decreased costs 12 of 20

5 Slide 13 Complex Survey Design Complex designs with clustering and unequal selection probabilities generally increase the sampling variance. Not accounting for the impact of complex sample design can lead to Type I error. 13 of 20 Slide 14 Sample Weights Used to adjust for differing probabilities of selection In theory, simple random samples are self-weighted 14 of 20 Slide 15 Sample Weights (cont.) Used to adjust for differing probabilities of selection In theory, simple random samples are self-weighted In practice, simple random samples are likely to also require adjustments for non-response 15 of 20

6 Slide 16 Types of Sample Weights Post-stratification weights: designed to bring the sample proportions in demographic subgroups into agreement with the population proportion in the subgroups. 16 of 20 Slide 17 Types of Sample Weights (cont.) Non-response weights: designed to inflate the weights of survey respondents to compensate for nonrespondents with similar characteristics. 17 of 20 Slide 18 Types of Sample Weights (cont.) Blow-up (expansion) weights: provide estimates for the total population of interest 18 of 20

7 Slide 19 Syntax Examples of Design-based Analysis in STATA, SUDAAN & SAS STATA svyset strata strata svyset psu psu svyset pweight finalwt svyreg fatitk age male black hispanic SUDAAN proc regress data= c:\nhanes.sav filetype=spss desgn=wr; nest strata psu; weight finalwt subpgroup sex race; levels 2 3; model fatintk = age sex race; 19 of 20 Slide 20 Syntax Examples of Design-based Analysis in STATA, SUDAAN & SAS SAS proc surveyreg data=nhanes; strata strata; cluster psu; class sex race; model fatintk = age sex race; weight finalwt 20 of 20

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