Statistical Analysis

When you perform automatic or visual curve matching, AQTESOLV provides a statistical analysis of the curve fitting results.

• Residual statistics and residual plots help you analyze the errors between the observed displacement data and an aquifer test solution.
• Standard errors allow you to construct approximate confidence intervals for each hydraulic parameter (e.g., T or S) in an aquifer test solution (automatic curve matching only).

Residual Plots

Only AQTESOLV includes the following residual plots help to evaluate the fit of a model: residual vs. time, residual vs. simulated and normal probability plots.

Normal probability plot for a pumping test in an unconfined aquifer. A normal distribution of the model errors is indicated by residuals falling on a straight line.

Statistical Diagnostics Report

Only AQTESOLV supplies you with parameter statistics including confidence intervals.

The Diagnostics report shows parameters estimated by automatic curve matching and their approximate confidence intervals.