Los Alamos National Laboratory

Los Alamos National Laboratory

Delivering science and technology to protect our nation and promote world stability
Find Expertise logo

Profile Pages

View homepages for scientists and researchers. Explore potential collaborations and project opportunities. Search the extensive range of capabilities by keyword to quickly find who and what you are looking for.

Aparna V. Huzurbazar

Aparna Huzurbazar

Email
Phone (505) 664-0873

Capabilities

  • Computational Physics and Applied Mathematics
  • Statistics
  • Uncertainty quantification
  • Uncertainty analysis
  • Weapons Science and Engineering
  • Stockpile stewardship
  • Life extension programs
  • Uncertainty quantification
  • Surety
  • Quantification of margins and uncertainty (QMU)
  • Stockpile surveillance

Expertise

I am interested in providing quantitative contributions and insights to improve policy and decision-making. My expertise is in

  • Flowgraph and multistate models 
  • Bayesian methods
  • System reliability and prediction
  • Stochastic networks and engineered systems.

Education

  • Ph. D., Statistics, 1994, Colorado State University, Fort Collins, CO.
    • Dissertation:  Prediction in Stochastic Networks
  • B.S., Aerospace Engineering, 1988, University of Colorado, Boulder, CO.
  • B.A., Mathematics, 1988, Claremont McKenna College, Claremont, CA.
Additional Certifications:
  • Certified Six Sigma Master Black Belt (2009)
 

 

 

LANL Positions

Current Position: Research Scientist, Statistical Sciences Group CCS-6.

Previous Positions:

2007-2008, Technical Staff Member, Statistical Sciences Group, Los Alamos National Laboratory, Los Alamos, NM.
2007-2009, Professor (tenured), Department of Mathematics and Statistics, University of New Mexico, Albuquerque, NM. (on leave while at LANL).
2001-2007, Associate Professor (tenured), Department of Mathematics and Statistics, University of New Mexico, Albuquerque, NM.
1996-2001, Assistant Professor (tenure-track), Department of Mathematics and Statistics, University of New Mexico, Albuquerque, NM.
1994-1996 Assistant Professor (tenure-track), Department of Statistics, University of Florida, Gainesville, FL.
1989-1994, Graduate Teaching Assistant, Department of Statistics, Colorado State University, Fort Collins, CO.     
1986-1988, Database Coordinator, Defense Meteorological Satellite Program, Boulder, CO. 
 
Employment History: Concurrent and Visiting Appointments
2009-2011, Adjunct Full Professor, Department of Mathematics and Statistics, University of New Mexico, Albuquerque, NM. 
2004-2007 Faculty Affiliate, Los Alamos National Laboratory, Los Alamos, NM. Concurrent appointment.
2001-2007 Adjunct Faculty, RAND Corporation, Santa Monica, CA. Concurrent appointment.
2002-2003 Sabbatical Visitor to the Statistics Group at the RAND Corporation, Santa Monica, CA.  Worked with Project AIR FORCE, Aging Aircraft Availability and Operation Costs Project. 
Fall 1999, Visiting Fellow, jointly with the Centre for Mathematics and its Applications, Statistics Science Program, and Dept. of Statistics and Econometrics, Australian National University, Canberra, Australia.
1996-2007, Statworks: my private consulting enterprise. Provided statistical expertise to local area firms.
1991-1992 Statistical Consultant, Fort Collins, CO. Worked with management consultants for local companies including Hewlett Packard and Kodak.
 

 

 

Awards

 
Fellow, American Statistical Association, 2008.
Elected Member, International Statistical Institute, 2006.
 
 
 

Publications

Book: Huzurbazar, A.V. (2005). Flowgraph Models for Multistate Time-to-Event Data. New York: John Wiley & Sons. 

Selected Publications:

1. Bierbaum, R., Diegert, K., Hamada, M., Huzurbazar, A., Robertson, A. (2014). Using Statistical Methods to Assess a Surveillance Program. Quality Engineering, 26: 416-423. 
2. Storlie, C., Fugate, M., Higdon, D., Huzurbazar, A., Francois, E., McHugh, D. (2013)  "Methods for Characterizing and Comparing Populations of Shock Wave Curves", Technometrics, 55(4), 436-449.
3. Collins, D., Freels, J.; Huzurbazar, A.; Weaver, B.; Warr, R. (2013) Accelerated Test Methods for Reliability Prediction. Journal of Quality Technology, 45(3), 244-259. Recipient of the 2014 Lloyd Nelson Award from ASQ.
4. Collins, D., Warr, R., and Huzurbazar, A. (2013). An Introduction to Statistical Flowgraphs for Engineering Systems. Journal of Risk and Reliability, Proceedings of the Institute of Mechanical Engineers, Part O, Volume 227, Issue 5, 461-470.
5. Collins, D. and Huzurbazar, A. (2013). Multistate Stochastic Processes: A Statistical Flowgraph Perspective, International Statistical Review, Vol.81, iss.1, p.78-106, 2013.
6.  Wilson, A., Anderson-Cook, C., and Huzurbazar, A. (2011). A Case Study for Quantifying System Reliability and Uncertainty. Reliability Engineering and System Safety, 96, 1076-1084.
7.   Anderson-Cook, C., Crowder, S., Huzurbazar, A., Lorio, J., Ringland, J., Wilson, A. (2011). Quantifying Reliability Uncertainty from Catastrophic and Margin Defects : A Proof of Concept. Reliability Engineering and System Safety, 96, 1063-1075. 
8. Collins, D., and Huzurbazar, A. (2011). Prognostic Models Based on Statistical Flowgraphs, Applied Stochastic Models in Business and Industry, 28(2):141-151.
9. Hamada, M., Huzurbazar, A., Vander Wiel, S., Wilson, A.  (2011). Assessing the Risks of Sampling Rates for Surveilling a Population, Quality Engineering, 23, 242252. DOI: 10.1080/08982112.2011.575747 
10. Collins, D., Anderson-Cook, C., and Huzurbazar, A. (2011). System Health Assessment, Quality Engineering, 23, 142-151.
11. Huzurbazar, A.V., and Williams, B.J. (2010). “Incorporating Covariates in Flowgraph Models: Applications to Recurrent Event Data", Technometrics, 52 (2), 198-208.
12. Warr, R., and Huzurbazar, A. (2010). Expanding the Statistical Flowgraph Model  Using Any Distribution, Journal of Statistical theory and Practice, 4(4), 529-539.
13. Wilson, A.G., Huzurbazar, A. V., and Sentz, K. (2009). “The Imprecise Dirichlet Model for Multilevel System Reliability", Journal of Statistical Theory and Practice, 3(1), 211-223.
14. Huzurbazar, A.V., Briand, D., and Cranwell, R.M. (2008). “Statistical Reliability with Applications to Defense". In Reliability Engineering Advances, Hayworth, G. (ed.). USA: Nova Science Publishers.
15. Briand, D. and Huzurbazar, A.V. (2008). “Bayesian Reliability Applications of a Combined Lifecycle Failure Distribution'', Journal of Risk and Reliability,  222(4), 713-720.
16. Collins, D., and Huzurbazar, A.V. (2008). “System Reliability and Safety Assessment Using Nonparametric Flowgraph Models",  Journal of Risk and Reliability,  222(4), 667-674.
17. Wilson, A.G., and Huzurbazar, A. V. (2007). “Bayesian Networks for Multilevel System Reliability", Reliability Engineering and System Safety, 92, 1413-1420.
18. Huzurbazar, A. V. (2007). “Flowgraph Models". In Encyclopedia of Statistics in Quality and Reliability,  Ruggeri, F., Kennett, R., and Faltin, F. (eds.). U.K.: John Wiley   & Sons, pp. 684-690.
19. Briand, D., Campbell, J.E., and Huzurbazar, A.V. (2007).  “Updating a User Friendly Combined Lifetime Failure Distribution'', Reliability and Maintainability Symposium, RAMS '07,  311 - 316.
16. Williams, B.J., and Huzurbazar, A.V. (2006). “Posterior Sampling with Constructed Likelihood Functions: An Application to Flowgraph Models", Applied Stochastic Models in Business and Industry, 22(2), 127-137.
17. Huzurbazar, A. V. (2005).”A Censored Data Histogram", Communications in Statistics: Simulation and Computation, 34(1), 113-120.
18. Huzurbazar, A.V. (2005). “Flowgraph Models: A Bayesian Case Study in Construction Engineering", Journal of Statistical Planning and Inference, 129, 181-193.
19. Huzurbazar, A.V., and  Williams, B.J. (2005). “Flowgraph Models for Complex Multistate System Reliability". In Modern Statistical and Mathematical Methods in Reliability, Wilson, A.G., Limnios N., Keller-McNulty, S.A., and Armijo, Y.M. (eds). Singapore: World Scientific, pp. 247-262.
20. Huzurbazar, A.V. (2005). “Flowgraph Models". In The Encyclopedia of Statistics, Volume 3, 2nd edition, Kotz, S., Johnson, N., Read, C., Balakrishnan, N., and Vidakovic, B. (eds.). New York: John Wiley  & Sons.
21. Huzurbazar, A.V. (2004). “Multistate Models, Flowgraph Models and Semi-Markov Processes", Communications in Statistics: Theory and Methods, 33, 457-474.
22. Huzurbazar, A.V. (2004). “Modelling Survival Data Using Flowgraph Models". In Handbook of Statistics Volume 23: Advances in Survival Analysis,  Balakrishnan, N., and Rao, C. R. (eds.). Amsterdam: Elsevier, pp. 729-746.
23. Yau, C.L., and Huzurbazar, A.V. (2002). “Analysis of Censored and Incomplete Survival Data Using Flowgraph Models", Statistics in Medicine, 21, No. 23, 3727-3743.
24. Huzurbazar, A.V. (2000). “Modeling and Analysis of Engineering Systems Data Using Flowgraph Models", Technometrics, 42, 300-306.
25. Butler, R.W. and Huzurbazar, A.V. (2000). “Bayesian Prediction of Waiting Times in Stochastic Models", The Canadian Journal of Statistics, 28, No. 2, 311-325.
26. Huzurbazar, A.V. (2000). “Modeling Time-to-Event Data Using Flowgraph Models". In Advances on Methodological and Applied Aspects of Probability and Statistics, Balakrishnan, N. (ed.). New York: Taylor and Francis, pp. 561-571.
27. Huzurbazar, S., and Huzurbazar, A.V. (2000). “Bayesian Models for Progressive Diseases", Chilean Journal of Statistics, 17, 29-43.
28. Huzurbazar, A.V. (1999). “Flowgraph Models for Generalized Phase Type Distributions with Non-exponential Waiting Times", The Scandinavian Journal of Statistics, 26, 145-157.
29. Huzurbazar, S. and Huzurbazar, A.V. (1999). “Survival and Hazard Functions for Progressive Diseases Using Saddlepoint Approximations", Biometrics, 55, 198-203
30. Butler, R.W. and Huzurbazar, A.V. (1997). “Stochastic Network Models for Survival Analysis", Journal of the American Statistical Association, 92, 246-257. 
31. Christensen, R. and Huzurbazar, A.V. (1996). “A Note on Augmenting Resolution III Designs", The American Statistician, 50, 175-177.