# Data Drift Report

Drift Report service creates a statistical report based on a comparison of training and production data distributions. It compares these two sets of data by a set of statistical tests and finds deviations.

![](https://52056325-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MESaD8WY3ggQLtBByXl-887967055%2Fuploads%2Fgit-blob-5f50cf6ac7374fe094ed50085fdcecaa099c0176%2Fdrift_report.png?alt=media)

Drift report uses multiple different tests with p=.95 for different features:

**Numerical** features:

* Levene's test with a trimmed mean
* Welch's t-test
* Mood's test
* Kolmogorov–Smirnov test

**Categorical** features:

* Chi-Square test
* Unseen categories

## Supported Models

Right now Drift Report feature works only for Models with numerical scalar fields.