ChemStat includes easy-to-use Windows 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 Features

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
• Fast performance
• 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
• On-line tutorial
• Tip-of-the-day
• 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

Graphs

• Box/Whisker Plots
• Single Well Concentration-Time Plot
• Multiple Well Concentration-Time Plot
• Probability Plots
• Control Chart for Intra-Well Comparison

Easily select the number of "future samples" for prediction limits.

Parametric Methods

• Parametric ANOVA with Individual Well Comparisons
• Parametric Prediction Limit (intra-well or inter-well comparison)
• Parametric Tolerance Limit
• Confidence Interval

Non-Parametric Methods

• 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

Distribution Testing

• 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.

ChemStat Requirements: PC 486/Pentium running Windows 95/98/2000/NT with 16 MB RAM.

See ChemPoint - RCRA and CERCLA Ground-Water Analysis Database for Windows for use with ChemStat.

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