# Vignette, Adding a New Index

#### Erik.Leppo@tetratech.com

#### 2026-07-22

# Purpose

To show the user how to add a new suite of metrics and scoring thresholds to allow for index calculation with the `metric.score` function.

# Resources Needed

The user will need the documentation for the intended index and preferably a test data set (typically in the documentation for the index).

# Steps

1. Add to MetricScores.xlsx (metrics and index).

2. Create testthat example for metric values and metric/index scores.