Learning Objectives
The list below outlines the objectives for each course in the tutorial. After completing the modules, users should be able to do the following:
Environmental Chemical Data Survey Orientation
Module 1: Environmental Chemical Data Overview
Task 1: Describe the History of Environmental Chemical Data Collection in NHANES
Task 2: Describe NHANES Environmental Chemical Data Collection Methods
Task 3: Describe Public Health Uses of the Environmental Chemical Data
Module 2: Navigate NHANES Website
Task 1: Navigate the NHANES Homepage
Task 2: Find Datasets on the NHANES Website
Task 3: Find Survey Background Information
Task 4: Find the Analytic and Reporting Guidelines
Task 5: Use the What's New Page
Task 6: Review the Frequently Asked Questions (FAQ) Page
Task 7: Find Important NHANES Citations
Task 8: Identfiy How to Get Help
Module 3: Environmental Chemical Data Structure and Content
Task 1: Describe How Environmental Chemical Data Fit into the NHANES Data Structure
Task 2: Describe Environmental Chemical Data Files
Task 3: Describe Non-probability Based Environmental Chemical Data Files
Task 4: Describe Environmental Chemical Data Subsample Files
Task 5: Describe Limit of Detection Issues and Variables
Task 6: Describe Multi-Year Data Issues
Module 4: Overview of NHANES Survey Design and Weighting
Task 1: Explain NHANES Survey Design
Task 2: Explain NHANES Sample Weights
Task 3: Explain NHANES Environmental Subsample Weights
Preparing an Environmental Analytic Dataset
Module 5: Locate Variables
Task 1: Decide Which Environmental Chemical Variables to Include in Your Dataset
Task 2: Identify Environmental Chemical Variables to Include in Your Dataset
Task 3: Identify Correct Sample Weights and Their File Locations
Task 4: Identify Environmental Chemical Laboratory Methods and Corresponding Coefficients of Variation (CV) and Their File Locations
Module 6: Download Data
Task 1: Create a Directory
Task 2: Download Data Files, Laboratory Manuals, and Documentation
Task 3: Extract or Import Datasets
Module 7: Merge & Append Datasets
Task 1: Merging Data in NHANES
Task 2: Appending Data in NHANES
Module 8: Review Data & Create New Variables
Task 1: Identify and Recode Missing Data
Task 2: Check Distributions and Describe the Impact of Influential Outliers
Task 3: Check for Data Symmetry
Task 4: Create New Variables
Module 9: Format & Label Variables
Task 1: Define and Assign Formats and Labels
Module 10: Save a Dataset
Task 1: Create a Permanent Dataset in a SAS Library
Task 2: Save NHANES Data to a microsoft Excel Spreadsheet with SAS
Critical Issues for the Analysis of Environmental Chemical Data
Module 11: Important Analytic Considerations and Limitations
Task 1: Explain Concentrations of Chemicals in Bloood and Urine Compared to Concentration of Chemicals in the Environment
Task 2: Limit of Detection (LOD) Considerations
Task 3: Subsamples and Weights Associated with Environmental Chemical Data
Task 4: Other Data Considerations and Limitations Related to Environmental Chemical Data
Module 12: Data Normality and Transformations
Task 1: Check for Data Normality
Task 2: Transformation of Variables to Approximate a Normal Distribution
Module 13: Using Blood Lipid or Urine Creatinine Adjustments of Environmental Chemical Data
Task 1: Using Blood Lipid or Urine Creatinine Adjustments
Environmental Chemical Data Analyses
Module 14: Estimating Variance, Analyzing Subgroups and Calculating Degrees of Freedom for Performing Statistical Tests and Calculating Confidence Intervals
Task 1: Explain Variance Estimation Within NHANES
Task 2: Describe Methods for Variance Estimation Used in NHANES
Task 3: Calculate Degrees of Freedom for Performing Statistical Tests and Calculating Confidence Limits
Module 15: Estimate Means/Geometric Means and Percentiles of Environmental Chemical Data
Task 1: Check Frequency Distribution and Normality
Task 2: Generate Percentiles
Task 3: Generate Geometric Means
Task 4: Generate Proportions
Module 16: Testing Hypotheses
Task 1: Use the t-test Statistic
Task 2: Generate Confidence Intervals
Task 3: Perform Chi-Square Test
Contact Us:
- National Center for Health Statistics
3311 Toledo Rd
Hyattsville, MD 20782 - 1 (800) 232-4636
- cdcinfo@cdc.gov