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U.S. Department of Agriculture National Agricultural Statistics Service Research and Development Division |
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U.S. Department of Agriculture National Agricultural Statistics Service Research and Development Division |
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of the Director |
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Chief
Research Statistician
The Chief
Research Statistician, Dr.
Phillip
S. Kott, provides expert advice to mathematical
statisticians in the Division and the Agency on statistical
methodology. He also provides advice and support to other USDA
agencies, such as the Agricultural Marketing Service, on a variety of
statistical and methodological matters. NASS has been revamping many of
its sampling designs and
estimators under Dr. Kott's direction. These changes are increasing the
efficiency of the Agency's estimation strategies, better adjusting for
survey nonresponse and undercoverage, and limiting, as much as
possible,
the burden on respondents. Dr. Kott has developed and is currently
running an e-correspondence
course on survey sampling theory and methods at the masters-degree
level for interested NASS employees. He is a fellow of the American
Statistical
Association and a member of the International Statistical Institute.
Dr. Kott also serves as an associate editor and referee for a number of
scholarly journals. |
| Research Reports |
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| Kott, Phillip S.
and Garren,
Steven
T. (2009), "Evaluating
the Asymptotic Limits of the Delete-a-Group Jackknife for Model
Analyses." |
PDF |
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| Kott, Phillip S. (2008), "Revising the Estimation Strategy
for the Pesticide Data Program." |
PDF |
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| Kott, Phillip S. and Chang, Ted (2008), "Can Calibration Be
Used to Adjust for 'Nonignorable' Nonresponse?,"Extension of Paper
presented at the
Joint Statistical Meetings, Denver, Colorado. |
PDF |
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| Kott, Phillip S. and Liu, Yan,
K. (2008), "Two Papers on One-Sided Coverage Intervals for a
Proportion," The result of research conducted in support of an earlier
paper presented at the 2007 Joint Statistical Meetings, Salt Lake City,
Utah. |
PDF |
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| Kott, Phillip S. (2008),
"Building a Better Delete-a-Group Jackknife for a Calibration Estimator
(Like That Based on Data from the ARMS III)," Extension of paper
presented at the Workshop on Calibration and Estimation in Surveys,
Ottawa, Ontario. |
PDF |
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| Kott, Phillip
S. (2007), "Variance Estimation for Establishment Surveys: An
Introductory Overview." Accompanying paper to an
introductory overview lecture given at the Third International
Conference on Establishment Surveys, Montreal, Quebec. |
PDF |
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| Chang, Ted and Kott, Phillip
S. (2007), "Using Calibration Weighting to Adjust for Nonresponse Under
a Plausible Model (with full appendices)." |
PDF |
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| Kott,
Phillip S. (2005), "Estimating the Mean Across Individuals of the
Long-Term Proportion of a Nutrient Intake Contributed by a Food." |
PDF |
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| Kott, Phillip S. (2005), "'No'
Is the Easiest Answer: Using Calibration to Assess Nonignorable
Nonresponse in the 2002 Census of Agriculture," Paper presented at the
Joint Statistical Meetings, Minneapolis, Minnesota. |
PDF |
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| Kott, Phillip S. (2004),
"Collected Technical Notes on Weighting and Its Impact on the 2002
Census of Agriculture." |
PDF |
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| Kott, Phillip S. and Brewer, K. R. W. (2001),
"Estimating the Model Variance of a Randomization-Consistent Regression
Estimator," Paper presented at the Joint Statistical
Meetings, Atlanta, Georgia. |
PDF |
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| Kott, Phillip S. and Bailey, Jeffrey T. (2000), "The
Theory and Practice of Maximal Brewer Selection with Poisson PRN
Sampling," Paper presented at the International Conference on
Establishment Surveys, II, Buffalo, New York . |
PDF |
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| Kott, Phillip S. and Fetter, Matthew J. (1999), "Using
Multi-Phase Sampling
to Limit Respondent Burden Across Agriculture Surveys," Paper presented at the
Statistical Society of Canada Annual Meeting, Regina, Saskatchewan. |
PDF |
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| Kott, Phillip S. (1998), "Using the
Delete-a-Group Jackknife Variance Estimator in NASS Surveys", NASS
research
report, revised July 2001. |
PDF |
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| Kott, Phillip S. (1997), "A (Partially) Model-Based
Look at Jackknife Variance Estimation with Two-Phase Samples," Paper presented at the
Statistical Society of Canada Annual Meeting, Fredericton, New
Brunswick. |
PDF
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| Kott, Phillip S. (1995), "A Paradox of Multiple
Imputation," Paper presented at the Joint Statistical
Meetings, Orlando, Florida. |
PDF |