List of Formulas

Customize how Bill-Watch detects anomalies

Bill-Watch uses a library of mathematical formulas to spot unusual usage patterns. Each formula applies a different statistical or threshold-based test.  Click any formula name below to learn more or jump straight into the Simulator.

Amount-Based Formulas

• Amount By Last

• Amount By Max

• Amount By Min

• Amount By Average

• Amount By Median

Percentage-Based Formulas

• Percentage By Last

• Percentage By Max

• Percentage By Min

• Percentage By Average

• Percentage By Median

Statistical Formulas

• Z-Score

• Modified Z-Score

• Grubbs Test

• Interquartile Range

Trend & Regression Formulas

• Regression Residual

• Trend Deviation