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NHANES Dietary Web Tutorial

Basic Dietary Analyses

The Basic Dietary Analyses course contains 5 modules:

Module 12.  Identify Important Statistical Considerations Regarding Dietary Data  Analyses

Module 13.  Estimate Variance, Analyze Subgroups, and Calculate Degrees of Freedom

Module 14.  Estimate Population Mean Intakes

Module 15.  Estimate Ratios

Module 16.  Test Hypotheses

These five modules demonstrate how to perform some of the most frequently requested analyses of NHANES dietary data.  The course begins with a description of the particular idiosyncrasies of dietary data, especially measurement error and its relevance to the interpretation of results.  The next module continues the statistical theme by showing how to estimate variances, analyze subgroups, and calculate degrees of freedom, given the NHANES sampling design.  The remaining modules demonstrate how to perform selected basic analyses with dietary data. 

The course is aimed at specific issues surrounding dietary analysis.  If you are interested in learning more about the basics of estimating means and prevalences, conducting t-tests or chi-square tests, generating confidence intervals, or performing age standardization or regression analyses, please see the Continuous NHANES Web Tutorial, NHANES Analysis Course.

If you are an experienced analyst who needs only specific information to help you complete an analysis on your own, you can pick and choose topics of interest from the navigation bar to the left, or from the Tutorial A-Z Index. You may also go to the Sample Code and Datasets page to download and modify sample programs and datasets for your own use.


Sample Code

Abbreviated SAS and SUDAAN code is presented throughout the tutorial for the sole purpose of demonstrating and explaining specific steps in an analysis. The abbreviated code does not comprise a complete SAS or SUDAAN program that can be readily submitted for a computer run. If you need the complete SAS or SUDAAN program, please consult the Additional Resources section of this tutorial.


Before you get started

  • Check out the Dietary Data Tutorial Roadmap to orient yourself to the tutorial’s content.

  • Read the Introduction to find answers to frequently asked questions about NHANES dietary data and this tutorial.

  • Browse through the Logistics section to learn about the web layouts and templates used in the tutorial and find out the basic knowledge and skills you’ll need to use the tutorial.

  • Go to Technical & Software Requirements for information about what’s required to view the tutorials correctly and run the sample programs properly.  This section also is the place to go if you need help with technical problems.

Contact Us:
  • National Center for Health Statistics
    3311 Toledo Rd
    Hyattsville, MD 20782
  • 1 (800) 232-4636
  • The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Road Atlanta, GA 30329-4027, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO
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