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Karen R. Ryberg

Statistician

U.S. Geological Survey
821 E Interstate Ave
Bismarck, ND 58503

Email: kryberg@usgs.gov
Phone: (701) 250-7422
Fax: (701) 250-7492

 Expertise/Projects/Research Interests:

  • Statistical analysis of hydrologic data, including parametric and nonparametric trend analysis, regression analysis, and cluster analysis
  • Analysis of pesticide concentration trends in surface water
  • Research related to hydrology and climate
  • Data mining including automated data retrieval and analysis, outlier detection, and data cleaning
  • Web access log analysis including usage patterns and trends, analysis of sessionized logs and navigation paths, data aggregation methods such as the Porter Stemming Algorithm
  • Graphical presentation of scientific data
  • R - Open Source Statistical Software
    • waterData package
    • seawaveQ package
  • Data munging - converting and processing large amounts of data for analysis and reporting
  • Science Communication
  • Social Media

 Education:

  • In progress, Doctorate of Philosophy, Environmental and Conservation Sciences - Environmental Science Track
    North Dakota State University, Fargo, North Dakota
    • The Honor Society of Phi Kappa Phi
  • Master of Science, Statistics, 2006
    Colorado State University, Fort Collins, Colorado
    • Masters Project: Water-Quality Trend Analysis for the Devils Lake Basin, North Dakota, January 1965 through September 2003
  • A.A.S, Computer Support Specialist, 2003
    Bismarck State College, Bismarck, North Dakota
    • Phi Theta Kappa Honor Society
  • B.A., Mathematics, 1995
    Luther College, Decorah, Iowa
    • The Phi Beta Kappa Society
    • Pi Mu Epsilon - Honorary National Mathematics Society
  • Graduate Certificate, Data Mining and Applications, 2008
    Stanford University, Stanford, California
  • Certificate, Management, 1996
    University of Mary, Bismarck, North Dakota

 Publications:

  • Ryberg, K.R., Lin, W., Vecchia, A.V., 2014 (online 2012), Impact of climate variability on runoff in the north-central United States: Journal of Hydrologic Engineering, v. 19, no. 1, 140-147, http://dx.doi.org/10.1061/(ASCE)HE.1943-5584.0000775
  • Ryberg, K.R. and Vecchia, A.V., 2013, seawaveQ---An R package providing a model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables: U.S. Geological Survey Open-File Report 2013--1255, 13 p., with 3 appendixes, http://dx.doi.org/10.3133/ofr20131255
  • Peterson, T.C., Heim, R., Hirsch, R.M., Kaiser, D., Brooks, H., Diffenbaugh, N.S., Dole, R., Giovannettone, J., Guiguis, K., Karl, T.R., Katz, R.W, Kunkel, K., Lettenmaier, D., McCabe, G.J., Paciorek, C.J., Ryberg, K.R., Schubert, S., Silva, V.B.S., Stewart, B., Vecchia, A.V., Villarini, G., Vose, R.S, Walsh, J., Wolock, D., Wolter, K., Woodhouse, C.A., Wehner, M., and Wuebbles, D., 2013, Monitoring and understanding changes in heatwaves, coldwaves, floods and droughts in the United States: State of knowledge: Bulletin of the American Meteorological Society, http://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-12-00066.1
  • Ryberg, K.R. and Vecchia, A.V., 2012, waterData---An R package for retrieval, analysis, and anomaly calculation of daily hydrologic time series data, version 1.0: U.S. Geological Survey Open-File Report 2012--1168, 8 p. -- URL http://pubs.usgs.gov/of/2012/1168/
  • Hirsch, R.M. and Ryberg, K.R., online 2011, print 2012, Has the magnitude of floods across the USA changed with global CO2 levels? Hydrolological Sciences Journal, v. 57(1), http://www.tandfonline.com/doi/abs/10.1080/02626667.2011.621895 and http://www.usgs.gov/newsroom/article.asp?ID=3006
  • Ryberg, K.R.; Vecchia, A.V.; Martin, J.D.; Gilliom, R.J., 2010, Trends in pesticide concentrations in urban streams in the United States, 1992-2008: U.S. Geological Survey Scientific Investigations Report 2010-5139, 101 p. -- URL http://pubs.usgs.gov/sir/2010/5139/
  • Ryberg, K.R.; Emerson, D.G.; and Macek-Rowland, K.M., 2009, Solid precipitation measurement intercomparison in Bismarck, North Dakota, from 1988 through 1997: U.S. Geological Survey Scientific Investigations Report 2009–5180, 24 p. --URL http://pubs.usgs.gov/sir/2009/5180/
  • Ryberg, K.R.; Hiemenz, Gregory, 2009, Summary and analysis of water-quality data for the Arrowwood National Wildlife Refuge, east-central North Dakota, 1987-2004: U.S. Geological Survey Scientific Investigations Report 2009-5017, 92 p. -- URL http://pubs.er.usgs.gov/usgspubs/sir/sir20095017
  • Ryberg, K.R., 2008, PFReports: A program for systematic checking of annual peaks in NWISWeb: U.S. Geological Survey Open-File Report 2008-1284, 17 p. -- URL http://pubs.usgs.gov/of/2008/1284/
  • Ryberg, K.R., 2007, Continuous water-quality monitoring and regression analysis to estimate constituent concentrations and loads in the Sheyenne River, North Dakota, 1980-2006: U.S. Geological Survey Scientific Investigations Report 2007-5153, 22 p. -- URL http://pubs.usgs.gov/sir/2007/5153/
  • Ryberg, K.R., 2007, Summary and trend analysis of water-quality data for the Oakes Test Area, southeastern North Dakota, 1984-2004: U.S. Geological Survey Scientific Investigations Report 2007-5056, 118 p. -- URL http://pubs.usgs.gov/sir/2007/5056/
  • Ryberg, K.R.; Banse, T.A., 2007, Analysis of Central Region Water Science Center web access logs, August 1, 2006-July 31,2007: U. S. Geological Survey Internal Report, 15 vols, [variously paged]
  • Ryberg, K.R.; Macek-Rowland, K.M.; Banse, T.A.; Wiche, G.J., 2007, A history of flooding in the Red River Basin: U.S. Geological Survey General Information Product 55, 1 sheet. -- URL http://pubs.usgs.gov/gip/2007/55/
  • Ryberg, K.R.; Macek-Rowland, K.M.; Wiche, G.J.; Klapprodt, L.A., 2007, 10th anniversary of the 1997 Red River flood: U.S. Geological Survey General Information Product 49, 1 sheet. -- URL http://pubs.water.usgs.gov/gip49/
  • Ryberg, K.R., 2006, Cluster Analysis of water-quality data for Lake Sakakawea, Audubon Lake, and McClusky Canal, Central North Dakota, 1990-2003: U.S. Geological Survey Scientific Investigations Report 2006-5202, 38 p. -- URL http://pubs.water.usgs.gov/sir2006-5202/
  • Ryberg, K.R., 2006, Continuous water-quality monitoring and regression analysis to estimate constituent concentrations and loads in the Red River of the North, Fargo, North Dakota, 2003-05: U.S. Geological Survey Scientific Investigations Report 2006-5241, 35 p. -- URL http://pubs.water.usgs.gov/SIR20065241
  • Ryberg, K.R.; Vecchia, A.V., 2006, Water-quality trend analysis and sampling design for the Devils Lake Basin, North Dakota, January 1965 through September 2003: U.S. Geological Survey Scientific Investigations Report 2006-5238, 64 p. -- URL http://pubs.usgs.gov/sir/2006/5238/
  • Ryberg, K.R.; Damschen, W.C.; Vecchia, A.V., 2005, Graphical user interface for accessing water-quality data for the Devils Lake Basin, North Dakota: U.S. Geological Survey Open-File Report 2005-1419, 15 p. -- URL http://pubs.water.usgs.gov/ofr20051419
  • Macek-Rowland, K.M.; Arntson, A.D.; Ryberg, K.R.; Dahl, A.L.; Leib, A., 2004, Water-use data for the Red River of the North Basin, North Dakota, Minnesota, and South Dakota, 1979-2001: U.S. Geological Survey Open-File Report 2004-1308, 255 p. -- URL http://pubs.water.usgs.gov/ofr20041308/

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