Publications

Google Scholar Profile

Selected Peer-Reviewed Publications

Park Y, Simpson DG. (2019). Robust probabilistic classification applicable to irregularly sampled functional data. Computational Statistics & Data Analysis. Vol. 131, pp.37-49 .  DOI: 10.1016/j.csda.2018.08.001

Chen S, McFarlin BL, Meagher BT, Peters TA, Simpson DG, O’Brien WD, & Han A (2019). A Phantom-Based Assessment of Repeatability and Reproducibility of Transvaginal Quantitative Ultrasound. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control66(9), 1413-1421. https://doi.org/10.1109/TUFFC.2019.2921925

Nolan R, Adie SG, Marjanovic M, Chaney EJ, South FA, Monroy GL, Shemonski ND, Erickson-Bhatt SJ, Shelton RL, Bower AJ, Simpson DG, Cradock KA, Liu ZG, Ray PS, Boppart SA. (2016). Intraoperative optical coherence tomography for assessing human lymph nodes for metastatic cancer. BMC Cancer 16:144. Online

McFarlin BL, Kumar V, Bigelow TA, Simpson DG, White-Traut RC, Abramawicz JS, O’Brien WD. (2015). Beyond Cervical Length: A pilot study of ultrasonic attenuation for early detection of preterm birth risk. Ultrasound in Medicine and Biology,  Vol. 41, No. 11,  pp. 3023-3029.  Online

Wirtzfeld LA, Ghoshal G, Rosado-Mendez IM, Nam K, Park Y, Pawlicki AD, Miller RJ, Simpson DG, Zagzebski JA, Oelze ML, Hall TJ, O’Brien WD. (2015). Quantitative ultrasound comparison of MAT and 4T1 mammary tumors in mice and rats across multiple imaging systems. Journal of Ultrasound in Medicine, Vol. 34, pp. 1373-1383. PubMed

Smith BW, Simpson DG, Sarwate S, Miller RJ, Erdman JW, O’Brien WD. (2015). Contrast ultrasound imaging of the aorta does not affect progression of atherosclerosis or cardiovascular biomarkers in ApoE-/- mice. Journal of Ultrasound in Medicine, Vol. 34, pp. 1115-1122. PubMed

Smith BW, Simpson DG, Miller RJ, Erdman JW, O’Brien WD. (2015). Contrast ultrasound imaging does not affect Hsp 70 expression in cholesterol-fed rabbit aorta. Journal of Ultrasound in Medicine, Vol. 34(7), pp. 1209-1216. PubMed

Han A, Erdman JW, Simpson DG, Andre MP, O’Brien WD. (2014). Early Detection of Fatty Liver Disease in Mice via Quantitative Ultrasound. Proceedings of the 2014 IEEE Ultrasonics Symposium, pp 2363-2366. PDF

Wirtzfeld LA, Nam K, Labyed Y, Ghoshal G, Haak A, Sen-Gupta E, He Z, Hirtz NR, Miller RJ, Sarwate S, Simpson DG, Zagzebski JA, Bigelow TA, Oelze ML, Hall TJ, O’Brien WD. (2013). Techniques and evaluation from a cross-platform imaging comparison of quantitative ultrasound parameters in an in vivo rodent fibroadenoma model. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. Vol. 60, 1386-1400. PDF

Imrey PB, Simpson DG (2012). Categorical data. In: Encyclopedia of Environmetrics, Second Edition. Wiley, New York. In press.

Yang Y, Simpson DG. (2012). Conditional decomposition diagnostics for regression analysis of zero-inflated and left-censored data. Statistical Methods in Medical Research, August 2012 21:379-392. PDF

Smith BW, Simpson DG, Sarwate S, Miller RJ, Blue JP, Haak A, O’Brien WD, Erdman JW (2012). Contrast ultrasound imaging of the aorta alters vascular morphology and circulating von Willebrand Factor in hypercholesterolemic rabbits. Journal of Ultrasound in Medicine, 31, 711-720. PMID: 22535718 PDF

Wirtzfeld LA, Ghoshal G, Hafez ZT, Nam K, Labyed Y, Anderson JJ, Herd M-T, Haak A, He Z, Miller RJ, Sarwate S, Simpson DG, Zagzebski JA, Bigelow TA, Oelze ML, Hall TJ, O’Brien WD. (2010). Cross-imaging platform comparison of ultrasonic backscatter coefficient measurements of live rat tumors. Journal of Ultrasound in Medicine, Vol. 29, pp. 1117-1123. PDF

Yang Y, Simpson DG (2010). Unified computational methods for regression analysis of zero-inflated and bound-inflated data. Computational Statistics and Data Analysis. Vol. 54, pp.1525-1534. PDF

O’Brien WD, Yang Y, Simpson DG (2009). Threshold estimation and superthreshold behavior of ultrasound-induced lung hemorrhage in rats: role of age dependency. Ultrasound in Medicine and Biology. 35, 129-135. PDF

Xie M, Simpson DG, Carroll RJ (2008). Semiparametric analysis of heterogeneous data using varying-scale generalized linear models. Journal of the American Statistical Association. Vol. 103, pp.650-660. PDF

O’Brien WD, Yang Y, Simpson DG, Frizzell LA, Miller RJ, Blue JP, Zachary JF (2006). Threshold estimates of ultrasound-induced lung hemorrhage in adult rabbits, and comparison of thresholds in mice, rats, rabbits and pigs. Ultrasound in Medicine and Biology. Vol 32, pp.1793-1804. PDF

O’Brien WD, Simpson DG, Frizzell LA, Zachary JF (2006). Superthreshold behavior of ultrasound-induced lung hemorrhage in adult rats: role of pulse repetition frequency and pulse duration. Journal of Ultrasound in Medicine, Vol. 25, pp.873-882. PDF

O’Brien WD, Simpson DG, Frizzell LA, Zachary JF (2005). Superthreshold behavior of ultrasound-induced lung hemorrhage in adult rats: role of pulse repetition frequency and exposure duration revisited. Journal of Ultrasound in Medicine. Vol. 24, pp.339-348. PDF

Simpson DG, Ho M, Yang Y, Zhou J, Zachary JF, O’Brien WD (2004). Excess Risk Thresholds in Ultrasound Safety Studies: Statistical Methods for Data on Occurrence and Size of Lesions. Ultrasound in Medicine and Biology. Vol. 30, pp. 1289-1295. PDF

O’Brien WD, Yang Y, Simpson DG (2004). Evaluation of unscanned-mode soft-tissue thermal index for rectangular sources. Ultrasound in Medicine and Biology. Vol. 30, pp. 965-972. PDF

O’Brien WD, Simpson DG, Frizzell LA, Zachary, JF (2004). Effect of contrast agent on the incidence and magnitude of ultrasound-induced lung hemorrhage in rats. Echocardiography. Vol. 21, pp. 417-422. PDF

Kim TY, Kim D, Park BU, Simpson DG (2004). Nonparametric detection of correlated errors. Biometrika. 91, 491-496. JSTOR

He X, Cui H, Simpson DG (2004). Longitudinal data analysis using t-type regression. Journal of Statistical Planning and Inference. Vol. 122, 253-269. Invited for volume in honor of J.W. Tukey. Online

O’Brien WD, Simpson DG, Frizzell LA, Zachary JF (2003). Threshold estimates and superthreshold behavior of ultrasound-induced lung hemorrhage in adult rats: Role of pulse duration. Ultrasound in Medicine and Biology. 29, 1625-1634. PDF

O’Brien WD, Simpson DG, Ho M, Miller RJ, Frizzell LA, Zachary JF (2003). Superthreshold behavior and threshold estimation of ultrasound-induced lung hemorrhage in pigs: Role of age dependency. IEEE Transactions on Ultrasound, Ferroelectrics, and Frequency Control. 50, 153-169. PDF

Simpson DG (2002). Comment on “Nearest Neighbor Variance Estimation (NNVE): Robust Covariance Estimation via Nearest Neighbor Cleaning.” Journal of the American Statistical Association. 97, 1015. Invited comment.

Fu L, Simpson DG (2002). Conditional risk models for ordinal response data: Simultaneous logistic regression analysis and generalized score tests. Journal of Statistical Planning and Inference. 108, 201-217. Invited for Volume in honor of C.R. Rao. Online

O’Brien WD, Simpson DG, Frizzell LA, Zachary JF (2001). Superthreshold behavior and threshold estimates of ultrasound-induced lung hemorrhage in adult rats: role of beamwidth. IEEE Transactions on Ultrasonics. Ferroelectrics, and Frequency Control. 48, 1695-1705. PDF

Imrey PB, Simpson DG (2001). Categorical data. In: Encyclopedia of Environmetrics. Wiley, New York.

Simpson DG (2001). Ordinal response. In: Encyclopedia of Environmetrics. Wiley, New York.

Zhou H, Xie M, Simpson DG, Weinberg CR (2001). A generalized likelihood ratio approach for cluster-correlated data from human fertility studies. Sankhya, Series B, Vol. 63, pp. 56-68. JSTOR

Zachary JF, Sempsrott JM, Frizzell LA, Simpson DG, O’Brien WD (2001). Superthreshold behavior and threshold estimation of ultrasound-induced lung hemorrhage in adult mice and rats. IEEE Transactions on Ultrasonics. Ferroelectrics, and Frequency Control. 48, 581-592. PDF

He X, Simpson DG, Wang G (2000). Breakdown points of t-type regression estimators. Biometrika, 87, 675-687. JSTOR

Simpson DG, Imrey P, Geling O, Butkus S (2000). Statistical estimation of child abuse rates from administrative databases. Children and Youth Services Review, 22, 951-971. PDF

Xie M, Simpson DG, Carroll, RJ (2000). Random effects in interval-censored ordinal regression: latent structure and Bayesian approach. Biometrics, 56, 376-383. JSTOR

Chen H-S, Simpson DG, Ying Z (2000). Infill asymptotics for a stochastic process model with measurement error. Statistica Sinica, 10, 141-156. PDF

Locantore N, Marron JS, Simpson DG, Tripoli N, Zhang JT, Cohen KL  (1999). Robust principal component analysis for functional data (with discussion). Test, 8, 1-73. PS

Xie M, Simpson DG (1999). Regression modeling of ordinal data with nonzero baselines. Biometrics, 55, 308-316. JSTOR

Xie M, Simpson DG (1998). Categorical exposure-response regression analysis of toxicology experiments. In Case Studies in Environmental Statistics, Ed. D. Nychka, W.W. Piegorsch and L.H. Cox. Lecture Notes in Statistics 132. Springer, p. 121-141. PDF

Simpson DG, Yohai VJ (1998). Functional stability of one-step GM-estimators in approximately linear regression. The Annals of Statistics, 26, 1147-1169. JSTOR

Simpson DG, He X, Liu YT (1998). Comment on “Edge-Preserving Smoothers for Image Processing.” Journal of the American Statistical Association, 93, 544-548. JSTOR

Ge N, Simpson DG (1998). Correlation and high dimensional consistency in pattern recognition. Journal of the American Statistical Association, 93, 995-1006. JSTOR

Xie M, Simpson DG, Carroll RJ (1997). Scaled link functions for heterogeneous ordinal response data. In Modelling Longitudinal and Spatially Correlated Data: Methods, Applications and Future Directions, Ed. T. Gregoire, Springer-Verlag, Lecture Notes in Statistics, p. 23-36. PDF

Guth DL, Carroll RJ, Simpson DG, Zhou H (1997). Categorical regression analysis of acute inhalation exposure to tetrachloroethylene.  Risk Analysis, 17, 321-332. Online

Simpson DG (1997). Introduction to Rousseeuw (1984), “Least Median of Squares Regression,” in Breakthroughs in Statistics, Volume III, Ed. by S. Kotz and N.L. Johnson, New York: Springer-Verlag, pp. 433-439.

Simpson DG (1997). Remarks on environmental data archives and their use in monitoring the US Mexico border area. Chemometrics and Intelligent Laboratory Systems, 37, 113-114.

Simpson DG, Chang YC (1997). Reweighting approximate GM estimators: asymptotics and residual-based graphics. Journal of Statistical Planning and Inference, 57(2), 273-294. Invited. Online

Simpson DG, Carroll RJ, Xie M, Guth DL (1996). Weighted logistic regression and robust analysis of diverse toxicology data. Communications in Statistics, Theory and Methods, 25, 2615-2632. Invited.

Simpson DG, Carroll RJ, Zhou H, Guth DL (1996). Interval censoring and marginal analysis in ordinal regression. Journal of Agricultural, Biological and Environmental Statistics, 1, 354-376. JSTOR

Eubank RL, Hart JD, Simpson DG, Stefanski LA (1995). Testing for additivity in nonparametric regression. The Annals of Statistics, 23, 1896-1920. JSTOR

Simpson DG (1993). Review of L1-Statistical Analysis and Related Methods, Edited by Y. Dodge. Journal of the American Statistical Association, 88, 1172.

He X, Simpson DG (1993). Lower bounds for contamination bias: Globally minimax versus locally linear estimation. The Annals of Statistics, 21, 314-337. JSTOR

Bietz J, Simpson DG (1992). Electrophoresis and chromatography of wheat proteins: available methods, and procedures for statistical evaluation of the data. Journal of Chromatography, 624, 53-80. Invited. Online

Simpson DG, Ruppert D, Carroll RJ (1992). On one-step GM-estimates and stability of inferences in linear regression. Journal of the American Statistical Association 87, 439-450. JSTOR

He X, Simpson DG (1992). Robust direction estimation. The Annals of Statistics 20, 351-369. JSTOR

Simpson DG (1991). Review of The Statistical Analysis of Discrete Data, by T. J. Santner and D. E. Duffy. Technometrics 33, 258-259.

Simpson DG, Guo S, Sacks J, Bietz JA, Huebner F, Nelson T (1991). Relating chromatographic data to measurements of wheat quality: case studies in dimension reduction. Chemometrics and Intelligent Laboratory Systems 10, 155-167. Online

Bietz JA, Huebner F, Nelson T, Simpson DG, Guo S, Sacks J (1991). Statistical interpretation of data from high-performance liquid chromatography of wheat proteins. In: Bushuk, W., and Tkachuk, R. (eds.) Gluten Proteins 1990 (Int. Workshop), 4th, pp.420-432.

Ruppert, D, Simpson, DG (1990). Comments on `Unmasking multivariate outliers and leverage points.’ Journal of the American Statistical Association 85, 644-646. JSTOR

He X, Simpson DG,  Portnoy, S (1990). Breakdown robustness of tests. Journal of the American Statistical Association 85, 446-452. JSTOR

Simpson DG, Margolin BH (1990). Nonparametric testing for dose-response curves subject to downturns: asymptotic power considerations. The Annals of Statistics 18, 373-390. JSTOR

Simpson DG (1989). Hellinger deviance tests: efficiency, breakdown points, and examples.  Journal of the American Statistical Association 84, 107-113. JSTOR

Simpson DG, Dallal GE (1989). BUMP: a FORTRAN program for identifying dose-response curves subject to downturns. Computers and Biomedical Research 22, 36-43. Online

Simpson DG (1987). Minimum Hellinger distance estimation for the analysis of count data. Journal of the American Statistical Association 82, 802-807. JSTOR

Simpson DG, Carroll RJ, Ruppert, D (1987). M-estimation for discrete data: asymptotic distribution theory and implications. The Annals of Statistics 15, 657-669. JSTOR

Simpson DG, Margolin BH (1986). Recursive nonparametric testing for dose-response relationships subject to downturns at high doses. Biometrika 73, 589-596. JSTOR

 

Professor, Department of Statistics