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NHANES Environmental Chemical Data Tutorial

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

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