ChemStat Statistical Analysis Software™
ChemStat is the easiest and fastest application available for the statistical analysis of ground water monitoring data at RCRA facilities. ChemStat includes most statistical analysis methods described in the 1989 and 1992 USEPA statistical analysis documents, USEPA Draft Unified Guidance Document, U.S. Navy Statistical Analysis Guidance document, and other guidance documents and methods documented in popular statistical texts.
A unique combination of ease-of-use and innovative technologies make ChemStat the value leader for environmental statistical analysis.
Download Animated Demonstration and Training Movies
All New ChemStat Universal Converter now available. Free utility to convert MS Access, MS Excel, tab-delimited text, and dBase files to ChemStat format.
Download ChemStat Trial Version (Version 6.4 Now Available)
ChemStat Frequently Asked Questions
Compare ChemStat to USEPA's DataQUEST Software
New Features for v. 6.4 (Available July, 2016):
- New Shewhart-CUSUM Control Chart follows "non-standardized" method of USEPA Unified Guidance
New Features for v. 6.3 (Available December 20, 2010):
- Tarone-Ware Two-Sample Test - A non-parametric test comparable to the Wilcoxon presented in the USEPA Unified Guidance.
New Features for v. 6.2 (Available April 1, 2007):
- Non-Parametric Confidence Limit MCL Comparison.
- Parametric Prediction Limit (inter-well) with verification resampling as described in USEPA Unified Guidance, for the following resampling schemes:
- 1 of 2
- 1 of 3
- 1 of 4
- Modified California
New Features for v. 6.1 (Available March 25, 2006):
- Export Workbook reports and graphs directly into Microsoft Word.
- Improved Workbook printing to Acrobat PDF files.
New Features for v. 6.0 (Available July 23, 2005):
- New methods for compliance with USEPA Draft Unified Guidance:
- Rank von Neumann test
- Spearman's Trend Test
- Welch's t-test
- New features for adjustment of data (add/remove samples based on date ranges, parameter names, well IDs)
- Improved Prediction Limits
- Improved Control Chart
- Improved Probability Plot
- Improved Graphs and Reports
New Features for v. 5.2:
- New Upper Confidence Limit (UCL) Methods Including:
- Student's t-test UCL Method
- Chebyshev Inequality UCL Method
- Central Limit Theorem UCL Method
- Bootstrap Resampling UCL Method
- Jackknife Procedure UCL Method
- Improved Probability Plot for Censored and Detects-Only Plots
New Features for v. 5.0:
- Improved graph vertical axis scaling
- Method Selector Tree -- Hierarchical tree simplifies the selection of the appropriate statistical tests.
- Poisson Prediction Limit not available as intra-well comparison
- New statistical methods, including methods from U.S. Navy (1999) statistical guidance documents.
- Improved Parametric t-test
- Satterthwaite t-test
- Quantile Non-Parametric test
- Two Sample Test of Proportions MCL Comparison
- Slippage Non-Parametric test
- Improved Wilcoxon test for group Reliability Expert Witness comparisons (following U.S. Navy Guidance)
- Discordance Outlier Test
- Enhanced parametric t-test follows U.S. Navy (1999) Guidance
New Features for v. 4.1:
- Parametric t-test analysis.
- Confidence interval analysis by Land's formula for log-normal data.
- Two-tailed parametric tolerance limits
New Features for v. 4.0:
- Fully automated statistical analysis -- perform a complete statistical analysis of an entire data set with a single command.
- Batch Processing -- Automated statistical analysis with scripts (create a script of commands for a list of parameters and perform all commands at once).
- Direct import of Sanitas and DUMPStat databases.
- Improved support for different parameter units.
- Automatic elimination of outliers.
- Mann-Kendall supports testing for upward, downward, or two-tailed trends.
New Features for v. 3.0:
- Easier File Importing -- File importing has been simplified. Preview the file to prevent formatting mistakes.
- Summary List summarizes of all wells showing statistically significant contamination for your project, showing parameter name, transformation, and statistical method.
- More Transformations -- In addition to natural logarithm transformations, you can choose log base 10, square root, or cube root transformations.