USGS IN YOUR STATE
USGS Water Science Centers are located in each state.
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Karen R. Ryberg
Statistician
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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
- 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
- Perl, S, and VBA programming
- Data munging - converting and processing large amounts of data for analysis and reporting
- Relational database creation and manipulation
- CGI programming for the web
Education:
- 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
- B.A., Mathematics, 1995
Luther College, Decorah, Iowa
- 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., 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/.
Links:
Organizational Chart
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