RCRA Subtitle C and D statistical analysis software for ground-water monitoring
ChemStat is a Windows 95/NT-based program for fast and accurate analysis of ground-water monitoring data at RCRA facilities. Analysis methods in ChemStat comply with 1989 and 1992 US EPA statistical guidance documents (included with the program). ChemStat is not a converted DOS program but is written as a 32-bit Windows 95/NT program from the first line of code. ChemStat is fast and powerful. The number of samples and number of wells are limited only by available computer memory. ChemStat has been tested on data sets with up to 5,000 samples.
ChemStat Analysis Methods
ChemStat includes easy-to-use Windows 95 interface features such as context-sensitive on-line help, Tip of the Day screen on startup, recent file lists, customizable printing with print-preview, spin buttons for numerical data entry, and more. Parameters and wells for analysis are selected from a drop-down list box on the main window tool bar.
ChemStat is not a database, but is designed specifically for statistical analysis of data. Data is imported from tab-delimited ASCII text files. Utilities to convert data from GRITS/STAT and ChemPoint formats are included. Importing accommodates filtering by start and end date, facility ID, and parameter suite. It also accepts comparison levels such as MCL for each parameter.
To reduce data set size, ChemStat has options to exclude all parameters with 100% non-detects. Results can be averaged for multiple samples on the same date (duplicates and replicates). Wells can be classified as up-gradient, down-gradient, or unused, and the well gradient can be changed.
ChemStat can perform any analysis on the original data or the natural log of the data. Easily represent non-detects by DL, 1/2 DL, 1, or 0. Normality tests can be used on the actual data or the residuals as required for parametric ANOVA.
ChemStat includes an Advisor Window which provides information about the selected method. If the data set is not suitable for the selected method such as too few samples or too many non-detects, the Advisor Window displays warnings or such unsuitability.
ChemStat includes a highly-customizable Control Chart for intra-well comparisons.
ChemStat is powerful. . .
Data set size limited only by computer memory for most tests
Unlimited number of parameters
Unlimited number of wells
Unlimited number of sample dates
Unlimited parameter name and well label length
Full report and graph printing and print preview
Export reports to tab-delimited ASCII text file
Export reports to a word processor in rich-text format
Complete year-2000 compliant date representation
Numerous choices for page headers and footers, page left, right, and center
Choice of multiple fonts and colors in graphs and reports
Highly customizable user-interface 32-bit executable provides absolute protection against program crashes caused by divide by zero or other math error
ChemStat is easy to learn. . .
Easily select parameter for analysis from drop-down list
Complete on-line help
Advisor Window displays information about the method and suitability of the method to the data set
Import Wizard to simplify data acquisition
ChemStat data acquisition. . .
Import Wizard takes you step-by-step through acquisition
Reads tab-delimited ASCII file
Convert from GRITS/STAT or ChemPoint formats
Extensive filtering of import files to read different combinations of data from a single file
Saves data in binary format
Option to exclude parameters with 100% non-detects
Option to exclude parameters with "R" data qualifier
Easily accept duplicate or replicate sample values, or average duplicates and replicates to give one value for the date
Easily plot time-concentration graphs for any combination of wells, and with a choice of symbol rotations.
ChemStat Analysis Methods
Single Well Concentration-Time Plot
Multiple Well Concentration-Time Plot
Control Chart for Intra-Well Comparison
Easily select the number of "future samples" for prediction limits.
Parametric ANOVA with Individual Well Comparisons
Parametric Prediction Limit (intra-well or inter-well comparison)
Parametric Tolerance Limit
Kruskal-Wallis Non-Parametric Analysis
Wilcoxon Rank-Sum Non-Parametric Analysis
Poisson Prediction Limit
Poisson Tolerance Limit
Non-Parametric Prediction Limit (intra-well or inter-well comparison)
Non-Parametric Confidence Limit
Levene's Test for Homogeneity of Variance
Bartlett's Test for Homogeneity of Variance
Shapiro-Wilks Test of Normality
Shapiro-Francia Test of Normality
Coefficient of Variation Test of Normality
D'Agostino's Test of Normality
Skewness Coefficient Test
ChemStat includes full print and print preview for all graphs and reports.
The Advisor Window provides a description of the selected test and advises about the suitability of the test for the data set (i.e., too few samples, too many non-detects, etc.).).
ChemStat provides extensive color selection for graph and report items. Samples showing statistically elevated levels of contamination detects can be displayed in different colors than other samples, or with shaded background to indicate statistically significant contamination when printed in black-and-white.
ChemStat Requirements: PC 486/Pentium running Windows 95/NT with 8 MB RAM.
Τελευταία Ενημέρωση 27 Ιουλίου 2004 - Last Revised on July 27th 2004
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