"Everything should be made as simple as possible, but not simpler." - Albert Einstein


N. Scott Urquhart

Research Scientist

Office: 206 Statistics Building
Phone: 970-491-3834
Fax: (970) 491-7895
Department of Statistics
Colorado State University
Fort Collins, CO 80523-1877

Joined Colorado State University in 2001


Degree Area Granting Institution Date
Ph.D. Statistics Colorado State University 1965
M.S. Statistics Colorado State University 1962
B.S. Mathematics Colorado State University 1961

Current Research Interests

Served as Director of the Department's Space-Time  Aquatic Resource Modeling and Analysis Program ( STARMAP ), funded by EPA. He has interests in design of ecological indicators and of ecological surveys, linear models and allied nonparametric methods; in collaborative research (internal consulting) with a variety of scientists and disciplines, particularly ones using computers in a variety of ways. He cooperates closely with EPA's Environmental Monitoring and Assessment Program (EMAP). This has led to him investigating the performance of sampling designs using the tools of experimental design. He has collaborated with ecological, environmental and agricultural researchers on a wide range of problems, both aquatic and terrestrial, from the desert southwest to the arctic to the Pacific Northwest.

Doctoral Student Dissertations

Kerry J. Ritter - Statistical Aspects of Two Measurement Problems: Defining Taxonomic Richness  and Testing with Unanchored Responses - 2001
Jean-Yves Pip Courbois - Comparison of Survey Estimates of the Finite Population Variance - 2000.
Trent McDonald - Analysis of Finite Population Surveys: Sample Size and Testing Considerations. 1996.
Mohammed F. Qadir - Using Percentile Regression for Estimating the Maximum Species Richness Line. 1994.

Selected Recent Publications

  • Theobald, D.M., D.L. Stevens, Jr., D. White, N.S. Urquhart, A.R. Olsen,  and J.B. Norman Using GIS to generate spatially-balanced random survey designs for natural resource applications.  Environmental Management  (in press for 2007)
  • Peterson, E.E. and N.S. Urquhart (2006). Predicting water quality impaired stream segments using landscape-scale data and a regional geostatistical model:   A case study in Maryland.  Environmental Monitoring and Assessment 121:613-636
  • Peterson, E.E., A.A. Merton, D.M. Theobald, and N.S. Urquhart (2006).  Patterns of spatial autocorrelation in stream water chemistry.  Environmental Monitoring and Assessment   121: 569-594
  • Kahl, J.S. J.L. Stoddard, R. Haeuber,  S.G. Paulsen, R. Birnbaum, F.A. Deviney,J.R. Webb, D.R. DeWalle, W. Sharpe, C.T. Driscoll, A.T. Herlihy, J.H. Kellogg, P.S. Murdoch, K. Roy, K.E. Webster, and N.S. Urquhart (2004).  How have U.S. surface waters responded to the 1990 Clean Air Act Amendments?  Feature article, Environmental Science and Technology 38: 484A - 490A
  • Courbois, J.P. and N. S. Urquhart (2004).  Comparison of survey estimates of the finite population variance.  Journal of the Agricultural, Biological and Environmental Statistics 9 : 236-250.
  • Kincaid, T. M., D. P. Larsen, and N. S. Urquhart.  (2004).  The structure of variation and its influence on the estimation of status: Indicators of condition of lakes in the Northeast, U.S.A.   Journal of Environmental Monitoring and Assessment 98 : 1 - 21.
  • Larsen, D. P., P. K. Kaufmann, T. M. Kincaid, and N. S. Urquhart.  (2004).  Detecting persistent change in the habitat of salmon-bearing streams in the Pacific Northwest. Canadian Journal of Fisheries and Aquatic Sciences 61 : 283-291.
  • Waite, I.R., Herlihy, A.T., Larsen, D.P., Urquhart, N.S. and Klemm, D.J. (2004)  The effects of macroinvertebrate taxonomic resolution in large landscape bioassessments: an example from the Mid-Atlantic Highlands, U.S.A.  Freshwater Biology 49 : 474-489.
  • Urquhart, N.S. and J.C. Moore (2004).  Statistics in EPA's STAR Program: Learning Materials for Surface Water Monitoring.  OPPTS Tribal News 4 (3): 45 - 46.  (EPA 745-00-001) {Web accessible at http://www.epa.gov/opptintr/tribal/pubs.html/}
  • Larsen, D. P., T. K. Kincaid, S. E. Jacobs and N. S. Urquhart (2002).  Designs for evaluating local and regional scale trends.  Bioscience 51 : 1069 - 1078
  • Li, J., A. Herlihy, W. Gerth, P. Kaufmann, S. Gregory, N. Urquhart, and D. P. Larsen. (2001) Variability in stream macroinvertebrates at multiple spatial scales.  Freshwater Biology 46 : 87 - 97.
  • Herlihy, A.T., D.P. Larsen, S.G. Paulsen, N.S. Urquhart and B.J. Rosenbaum (2000).   Designing a Spatially Balanced, Randomised Site Selection Process for Regional Stream Surveys: The EMAP Mid-Atlantic Pilot Study. Environmental Monitoring and Assessment 63 : 95-113.
  • Peterson, S. A. and N. S. Urquhart (2000).  Estimating trophic state proportions of a regional lake population: are larger samples always better? Environmental Monitoring and Assessment 62 : 71 - 89.
  • Stevens, D. L., Jr. and N. S. Urquhart (2000).  Response designs and support regions in sampling continuous domains. Environmetrics 11 : 13 - 41.
  • Urquhart, N. S. and T. M Kincaid (1999).  Trend detection in repeated surveys of ecological responses. Journal of Agricultural, Biological and Environmental Statistics 4: 404 - 414.
  • Peterson, S. A., N. S. Urquhart, and E. B. Welch (1999).  Sample representativeness: a must for reliable regional estimates of lake condition. Environmental Science and Technology 33 : 1559-1565.
  • Peterson, S. A., D. P. Larsen, S. G. Paulsen and N. S. Urquhart (1998). Regional lake trophic patterns in the northeastern United States: Three approaches. Environmental Management 22 : 789 - 801.
  • Urquhart, N. S., S. G. Paulsen and D. P. Larsen. (1998). Monitoring for policy-relevant regional trends over time. Ecological
    Applications 8 : 246 - 257.
  • McDonald, T. L., D. S. Birkes and N. S. Urquhart (1996). Obtaining species: Sample size considerations. Environmental and
    Ecological Statistics 3 : 329 - 347.
  • VanLeeuwen, D.M. , L.W. Murray and N.S. Urquhart (1996). A mixed model with both fixed and random trend components across time. Journal of Agricultural, Biological and Environmental Statistics 1 : 435 - 453.
  • Stoddard, J.L., N.S. Urquhart, A.D. Newell and D. Kugler. (1996) The Temporally Integrated Monitoring of Ecosystems (TIME) project design 2. Detection of regional acidification trends. Water Resources Research 32 : 2529 - 2538.
  • Larsen, D. P., N. S. Urquhart and D. Kugler (1995). Regional scale trend monitoring of indicators of trophic condition of lakes. Water Resources Bulletin 31 :117 - 140.
  • Larsen, D.P., K.W. Thornton, N.S. Urquhart and S.G. Paulsen (1995). The role of sample surveys for monitoring the condition of the nation's lakes. Environmental Monitoring and Assessment 32 :101 - 134.
  • Ernst, T. L., N. C. Leibowitz, D. Roose, S. Stehman and N. S. Urquhart (1995). Evaluation of U. S. EPA Environmental Monitoring and Assessment Program (EMAP) Wetlands sampling design and classification. Environmental Management 19 :99 - 113.
  • Clason, D L., J. N. Corgan, C. M. Cryder-Wilson, and N. S. Urquhart (1994). Mixture fraction and linkage analysis for hybrid onions. N. Lang, L Billard, L. Conquest, D. Brillinger, L. Ryan, and J Greenhouse, ed. Case Studies in Biometry : p 145 - 156, Wiley, N.Y.
  • Eiceman, G. A., N. S. Urquhart and G. A. O'Connor (1993). Logistic and economic principals in gas chromatography-mass
    spectrometry use for plant uptake investigations. Journal of Environmental Quality 22 :167 - 173.
  • Urquhart, N. S., W. S. Overton and D. S. Birkes (1993). Comparing sampling designs for ecological monitoring. V. Barnet and K. F. Turkman, eds. Statistics for the Environmen t, p 71 - 85.John Wiley and Sons, London.
  • Cryder, C. A., J. N. Corgan, N. S. Urquhart and D. L. Clason (1991). Isozyme analysis of progeny derived from ( Allium fistulosum x Allium cepa ) x Allium cepa. Theoretical and Applied Genetics 82 :337-345.
  • Whitney, R. E. and N. S. Urquhart (1990). Using microcomputers to assist students in learning concepts of mathematical sciences. Academic Computing 4 (7):14-18, 49-53.
  • Eiceman, G. A., J. L. Gardea-Torresdey, G. A. O'Connor and N. S. Urquhart (1989). Sources of error in analysis of municipal sludges and sludge-amended soils for di(2-ethylhexyl) phthalate. Journal of Environmental Quality 18 :374-379.
  • Hendrickx, J. M. H., P. J. Wierenga, and N. S. Urquhart (1988). Optimal design of field experiments for determination of
    production functions. Soil Science Society of America Journal 52 :494-499.
  • Lindemann, W. C., G. Connell, N. S. Urquhart (1988). Previous sludge addition effects on nitrogen mineralization in freshly
    amended soil. Soil Science Society of America Journal 52 : 109-112.
  • Anderson, D. M. and N. S. Urquhart (1986). Using digital pedometers to monitor travel of cows grazing arid rangeland.
    Applied Animal Behaviour Science 16 :11-23.

Instructional & Departmental Activities

Has taught a variety of statistical methods courses at the graduate, advanced undergraduate, and lower division undergraduate levels. These include introductory and advanced courses in regression, his specialty, the analysis of variance, advanced data analysis, and an introductory survey course for business students. Recent teaching responsibilities have included introductory mathematical statistics at the undergraduate level and advanced data analysis which uses multivariate analysis in sophisticated computing environments . He served as thesis advisor for  Ph.D. and a M.S. candidates in Statistics at OSU, co-taught the consulting practicum for the graduates students in statistics, and taught a course on environmental sampling every other year , but is not presently actively involved in teaching regular classes .

Professional Societies/Responsibilities/Honors

  • Editor, Environmental and Ecological Statistics , 2003 - 2007
  • Member, Regional Committee, Western North America Region, Biometric Society, 1997 - 1999.
  • Distinguished Achievement Metal in recognition of Outstanding Contributions to the Development of Methods, Issues, Concepts and Applications of Environmental Statistics. Section on Statistics and the Environment, American Statistical Association, 1994.
  • Elected Fellow, American Statistical Association, 1988.
  • Westhafer Award recipient, New Mexico State University, for "Excellence in Teaching," 1987.
  • Associate Editor, American Statistician , 1981-83.
  • President, Biometric Society, WNAR, 1978.
  • Secretary and Treasurer, Biometric Society, WNAR, 1974-1976.
Other Interests: Whitewater Rafting