Welcome to the Measurement Error Webinar Series, organized by collaborators
from the National Cancer Institute, the Office of Dietary Supplements, the
United States Department of Agriculture, the Gertner Institute, Texas A&M
University, and Wake Forest University. The series is intended for
nutritionists, epidemiologists, statisticians, graduate students, and others
with an interest in measurement error in dietary intake data. A basic level of
familiarity with statistics and dietary assessment is recommended.
The goal of the webinar series is to provide participants with an
understanding of:
- the sources and magnitudes of dietary measurement errors;
- how measurement error may affect estimates of usual dietary intake distributions;
- how measurement error may affect analyses of diet-health relationships; and
- how the effects of measurement error may be mitigated.
Concepts related to accounting for complex survey methods, estimating total
intakes from diet and supplements, and the use of multiple dietary assessment
instruments and self-report data along with biomarker data to reduce measurement
error are also addressed.
An archive of the webinar series, which ran from September 20th to December
6th, 2011, is provided below. Session descriptions provide details on the topics
covered and the objectives, recommended resources, and key terms for each
webinar. In addition to the recordings, which can be viewed online, multiple
versions of the slide sets are available for download. The slides with speaking
notes will display two pages at a time by default to facilitate on-screen
viewing. For economical printing, a version with six slides per page is also
provided. Additional supporting materials, including a glossary, are available
from the links at the left of this page.
Session Descriptions
Webinar 1: Introduction to the problem of measurement error in dietary intake data
About the Presenter: Dr. Sharon Kirkpatrick is a nutrition
researcher at the National Cancer Institute and organizer of this webinar
series. Her work at the National Cancer Institute has largely focused on methods of assessing diet and of
analyzing dietary intake data to account for measurement error. She is a member
of the Automated Self-administered 24-hour Recall (ASA24) team, leading
dissemination activities and user support in addition to contributing to the
design and development of ASA24. Other research interests include health
disparities and food security. Dr. Kirkpatrick earned her PhD in Nutritional
Sciences and MHSc in Community Nutrition from the University of Toronto.
Webinar 2: Estimating usual intake distributions for dietary components consumed daily by nearly all persons
About the Presenter: Dr. Kevin Dodd is a mathematical
statistician in the Biometry Research Group, Division of Cancer Prevention, at
the National Cancer Institute. His primary research interests focus on
statistical models for dietary intake and physical activity, with special
emphasis on population surveillance. He has been instrumental in the development
of novel statistical methods for estimating long-term exposure from short-term
observations for the past twenty years; beginning with the Iowa State University
method for estimating usual nutrient intake distributions and culminating in the
more recent National Cancer Institute method for modeling usual intake of
episodically consumed foods. Dr. Dodd earned his PhD and MS in Statistics from
Iowa State University.
Webinar 3: Estimating usual intake distributions for dietary components consumed episodically
About the Presenter: Dr. Janet Tooze is an Associate
Professor in the Department of Biostatistical Sciences, Division of Public
Health Sciences, at Wake Forest School of Medicine. Dr. Tooze is a
biostatistician with expertise in longitudinal data analysis and nonlinear mixed
effect models, with specific applications to diet and physical activity
assessment. Since 2002, she has been a member of the Surveillance Measurement
Error Group of the National Cancer Institute. In this capacity, she has
developed methods for estimating the usual intake of foods and nutrients in a
unified framework, with applications to nutritional surveillance and
epidemiology. Dr. Tooze received a PhD in Biometrics from the University of
Colorado Health Sciences Center and an MPH from the Harvard School of Public
Health.
Webinar 4: Accounting for complex survey design in modeling usual intake
About the presenter: Please refer to Dr. Dodd's biosketch
under Webinar 2 above.
Webinar 5: Estimating usual total nutrient intake distributions from diet and supplements
About the presenter: Dr. Regan Bailey is a nutritional
epidemiologist in the Office of Dietary Supplements (ODS) at the National
Institutes of Health. Dr. Bailey's research focuses on methodological issues
related to dietary assessment. Her work involves combining nutrient intakes from
foods and from dietary supplements to produce total nutrient intakes in
nationally-representative data sets, primarily centering on data from the
National Health and Nutrition Examination Survey (NHANES). Dr. Bailey is the
co-director of ODS's Dietary Supplement Research Practicum. She received her PhD
in Nutrition Science from the Pennsylvania State University and MS in Food and
Nutrition from the Indiana University of Pennsylvania.
Webinar 6: The problem of measurement error when examining diet-health relationships
About the presenter: Dr. Laurence (Larry) Freedman is currently
Director of the Biostatistics Unit at the Gertner Institute for Epidemiology at
Tel Hashomer, Israel, where he directs a research and consulting program in
biostatistics and advises the government on public health policy. He has
published extensively in the biostatistical literature on topics including
therapeutic and prevention trials, epidemiology, and nutrition, with particular
emphases on cancer research and nutritional epidemiology. He was founding
co-editor of Statistics in Medicine, and has also served as co-Editor of
Biometrics. In 2008, he received an award for outstanding contributions to the
International Biometric Society, and also delivered the annual Armitage lecture
to the Medical Research Council in Cambridge, UK. Dr. Freedman earned his PhD in
Biostatistics and MA in Mathematics from Cambridge University.
Webinar 7: Assessing diet-health relationships with FFQ: focus on dietary components consumed daily by nearly all persons
About the presenter: Douglas Midthune is a mathematical
statistician in the Biometry Research Group, Division of Cancer Prevention, at
the National Cancer Institute. His areas of research include statistical methods
for nutritional epidemiology and measurement error in dietary assessment, and he
has published many papers on these topics. He is an integral member of the
Surveillance Measurement Error Group of the National Cancer Institute, helping
to develop the National Cancer Institute method for modeling episodically
consumed foods. Recently, he has played an important role in the extension of
the method to accommodate simultaneous modeling of multiple nutrients and foods,
with applications to both estimation of usual intake distributions and
examination of diet and health relationships. Mr. Midthune earned his MS in
Statistics from the University of Maryland.
Webinar 8: Assessing diet-health relationships with FFQ: focus on episodically-consumed dietary components
 About the presenter: Dr. Victor Kipnis is a mathematical
statistician in the Biometry Research Group, Division of Cancer Prevention, at
the National Cancer Institute. He has authored and co-authored a number of
pivotal publications examining the structure of dietary measurement error, its
effects on study results, and methods of adjusting for it in nutritional
surveillance and epidemiology. Most recently, Dr. Kipnis has been involved in
the development of statistical approaches to estimate usual intake distributions
of episodically consumed dietary components and to adjust estimated
relationships between those dietary components and health outcomes for
measurement error. He played a leading role in the design and analysis of the
Observing Protein and Energy Nutrition biomarker study carried out at the
National Cancer Institute in 2001-2002. Dr. Kipnis received a PhD in Statistics
and MS in Mathematics from the Moscow State University.
Webinar 9: Estimating usual intake distributions for multivariate dietary variables
About the presenter: Dr. Raymond Carroll is Distinguished
Professor of Statistics at Texas A&M University. He is a member of the Faculties
of Nutrition and of Toxicology and holds a courtesy appointment in the
Department of Epidemiology and Biostatistics. Dr. Carroll’s work on statistical
methodology has found application in a broad variety of fields, including
nutritional epidemiology. He wrote the authoritative text on modern statistical
analysis of data when exposure measurements are subject to uncertainties, the
so-called measurement error problem. He has won many honors in the profession,
including the 1988 COPSS Presidents’ Award, given annually by the North American
statistical societies to the outstanding statistician under the age of 40. He
was the founding chair of the Biostatistics Study Section at the National
Institutes of Health. Dr. Carroll received his PhD from Purdue University.
Webinar 10: Combining self-report dietary assessment instruments to reduce the effects of measurement error
About the presenter: Please refer to Mr. Midthune's biosketch under Webinar 7 above.
Webinar 11: Combining self-report dietary intake data and biomarker data to reduce the effects of measurement error
About the presenter: Please refer to Dr. Freedman's biosketch under Webinar 6 above.
Webinar 12: Assessing diet-health relationships using a short-term unbiased dietary instrument: focus on risk models with multiple dietary components
About the presenter: Please refer to Dr. Kipnis' biosketch under Webinar 8 above.
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