D. Helsel

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Nondetects and data analysis : statistics for censored environmental data

D. Helsel, 2005 .

Statistical methods in water resources

D. Helsel, R. Hirsch, S. Archfield, 2020, Techniques and Methods.

More than obvious: better methods for interpreting nondetect data.

D. Helsel, 2005, Environmental science & technology.

NUTRIENTS IN THE NATION'S WATERS : TOO MUCH OF A GOOD THING ?

D. Helsel, D. K. Mueller, 1996 .

Regional Kendall test for trend.

D. Helsel, L. Frans, 2006, Environmental science & technology.

Statistical analysis of hydrologic data.

D. Helsel, R. Hirsch, D. Maidment, 1992 .

Estimation of Distributional Parameters for Censored Trace Level Water Quality Data: 2. Verification and Applications

D. Helsel, R. Gilliom, 1986 .

Baseline models of trace elements in major aquifers of the United States

D. Helsel, Lopaka Lee, 2005 .

Less than obvious - statistical treatment of data below the detection limit

Dennis R. Helsel, D. Helsel, 1990 .

THE IMPACT OF ATMOSPHERIC CONTAMINANTS ON STORM WATER QUALITY IN AN URBAN AREA

C. W. Randall, D. Helsel, T. Grizzard, 1979 .

A regional soil and sediment geochemical study in northern California

David B. Smith, D. Helsel, R. Wanty, 2009 .

Defining surfaces for skewed, highly variable data

D. Helsel, S. Ryker, 2002 .

Risk of nitrate contamination in groundwaters of the United States-- A national perspective

D. Helsel, B. Ruddy, B. Nolan, 1997 .

Statistics for Censored Environmental Data Using Minitab and R

Dennis R. Helsel, D. Helsel, 2012 .

Arsenic in Ground Water of the United States: Occurrence and Geochemistry

Dennis R. Helsel, Richard B. Wanty, D. Helsel, 2000 .

Risk of Nitrate in Groundwaters of the United StatesA National Perspective

Dennis R. Helsel, Bernard T. Nolan, D. Helsel, 1997 .

A Retrospective Analysis on the Occurrence of Arsenic in Ground-Water Resources of the United States and Limitations in Drinking-Water-Supply Characterizations

Dennis R. Helsel, Marilee A. Horn, Michael J. Focazio, 2000 .

Much ado about next to nothing: incorporating nondetects in science.

D. Helsel, DENNIS HELSEL, 2010, The Annals of occupational hygiene.

Complications with using ratios for environmental data: comparing enantiomeric ratios (ERs) and enantiomer fractions (EFs).

D. Helsel, W. Foreman, E. Ulrich, 2003, Chemosphere.

Fabricating data: how substituting values for nondetects can ruin results, and what can be done about it.

Dennis R Helsel, D. Helsel, 2006, Chemosphere.

Using wastewater-based epidemiology to estimate drug consumption-Statistical analyses and data presentation.

Christoph Ort, Caleb J Banta-Green, Alex J Brewer, 2016, The Science of the total environment.

A Laboratory and Field Evaluation of a Portable Immunoassay Test for Triazine Herbicides in Environmental Water Samples

D. Helsel, P. Capel, P. Squillace, 1993 .

Additional analysis of dendrochemical data of Fallon, Nevada.

D. Helsel, R. Speakman, P. Sheppard, 2012, Chemico-biological interactions.

Arsenic in Ground Water Supplies of the United States

D. Helsel, A. Welch, M. Focazio, 1999 .

Microbiological monitoring for the U.S. Geological Survey National Water-Quality Assessment Program

D. Helsel, D. Myers, D. Francy, 2000 .

Occurrence and Distribution of Microbiological Indicators in Groundwater and Stream Water

Dennis R. Helsel, Donna S. Francy, D. Helsel, 2000 .

Statistics for Censored Environmental DataUsing Minitab® and R: Helsel/Statistics for Environmental Data 2E

Dennis R. Helsel, D. Helsel, 2011 .

A national look at nitrate contamination of ground water

D. Helsel, B. Ruddy, B. Nolan, 1998 .

Estimation of descriptive statistics for multiply censored water quality data

Timothy A. Cohn, Dennis R. Helsel, D. Helsel, 1988 .

Methyl tert-butyl ether (MTBE) in public and private wells in New Hampshire: occurrence, factors, and possible implications.

Denise M. Argue, D. Helsel, S. Flanagan, 2008, Environmental science & technology.

Estimation of Distributional Parameters for Censored Trace Level Water Quality Data: 1. Estimation Techniques

Robert J. Gilliom, Dennis R. Helsel, D. Helsel, 1986 .

The Significance of heavy metals in urban runoff entering the Occoquan Reservoir

C. W. Randall, D. Helsel, T. Grizzard, 1981 .

Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin ground water management area, Washington

D. Helsel, L. Frans, 2005 .

The Value of Water Quality Information for National Environmental Regulation

Dennis R Helsel, D. Helsel, 1998 .

Advantages of nonparametric procedures for analysis of water quality data

Dennis R. Helsel, D. Helsel, 1987 .

Stability of low levels of perchlorate in drinking water and natural water samples.

D. Helsel, R. Wanty, S. Kalkhoff, 2006, Analytica chimica acta.

Effects of Agriculture on Ground‐Water Quality in Five Regions of the United States

Pixie A. Hamilton, Dennis R. Helsel, D. Helsel, 1995 .

Preliminary evaluations of regional ground-water quality in relation to land use

D. Helsel, S. Ragone, Doug Cain, 1989 .

Commentary Much Ado About Next to Nothing : Incorporating

D. Helsel, 2010 .

Evaluation of regional ground-water quality in relation to land use; US Geological Survey Toxic Waste--Ground-Water Contamination Program

D. Helsel, S. Ragone, 1984 .

Statistical analysis of water-quality data containing multiple detection limits: S-language software for regression on order statistics

Lopaka Lee, Dennis Helsel, D. Helsel, 2005, Comput. Geosci..

Nondetects and data analysis : statistics for censored environmental data

Dennis R. Helsel, D. Helsel, 2004 .

Computer program for the Kendall family of trend tests

Dennis R. Helsel, David K. Mueller, James R. Slack, 2006 .

Summing nondetects: Incorporating low‐level contaminants in risk assessment

Dennis R Helsel, D. Helsel, 2009, Integrated environmental assessment and management.

Assessing ground-water vulnerability to contamination: Providing scientifically defensible information for decision makers

Dennis R. Helsel, Michael J. Focazio, Thomas E. Reilly, 2002 .

DISCUSSION.: "Some Statistical Observations," by Geoff Kite

D. Helsel, W. Kirby, E. J. Gilroy, 1990 .

Estimation of Distributional Parameters for Censored Water Quality Data

D. Helsel, 1986 .

Nutrients in ground water and surface water of the United States: an analysis of data through 1992

D. Helsel, P. Hamilton, D. K. Mueller, 1995 .

Using Logistic Regression to Predict the Probability of Debris Flows in Areas Burned by Wildfires, Southern California, 2003-2006

J. E. Gartner, D. Helsel, S. Cannon, 2008 .

Insider Censoring: Distortion of Data with Nondetects

Dennis R. Helsel, D. Helsel, 2005 .

Statistical analysis of water-quality data containing multiple detection limits II: S-language software for nonparametric distribution modeling and hypothesis testing

D. Helsel, Lopaka Lee, 2007, Comput. Geosci..