Dennis R. Helsel

• Statistics for censored environmental data using Minitab and R
• Nondetects and data analysis
• Contributions of suspended sediment from highway construction and other land uses to the Olentangy River, Columbus, Ohio
• Estimation of distributional parameters for censored trace-level water-quality data
• Evaluation of regional ground-water quality in relation to land use
• Land use influences on heavy metals in an urban reservoir system
• Nondetects and data analysis
• Statistical methods in water resources