> ## Documentation Index
> Fetch the complete documentation index at: https://docs.redem.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Behavioral Analytics Score

> Learn how the Behavioral Analytics Score evaluates various typing behaviors

<img src="https://mintcdn.com/redemgmbh/JhRzQ1wyf4VQmVNq/images/BAS-Demo.gif?s=03a58d39aca537d44922a0dc5591fed1" alt="Grid-Question Score Example" width="800" height="301" data-path="images/BAS-Demo.gif" />

## What is the Behavioral Analytics Score?

The **Behavioral Analytics Score (BAS)** measures the quality of typing behavior to distinguish between natural human input and potentially artificial or automated responses. It helps detect answers generated by AI bots, scripts, or copy-paste actions—enhancing the reliability and authenticity of survey data.

## High-level checks performed

* Checks for unusually fast typing that is inconsistent with manual human input.
* Checks for copy-&-paste patterns (e.g., large blocks inserted with minimal keystroke events).
* Checks for highly uniform or repetitive keystroke rhythms that differ from typical human variation.
* Where instrumented, checks for behaviour metadata (e.g., pause durations between keystrokes, editing patterns) that deviate from expected human behaviour.
* Swipe Typing (Glide Typing): Detects swipe/glide typing on Android and iPhone. Classified as `NATURAL_TYPING` with a BAS score of 60. The score is intentionally conservative to reduce the impact of potential false negatives on the overall BAS score.
* Voice Dictation (Speech-to-Text): Detects speech-to-text input on Android and iPhone. Classified as `NATURAL_TYPING` with a BAS score of 60. The score is intentionally conservative to reduce the impact of potential false negatives on the overall BAS score.

## Mouse Movement and Clicks

When your integration tracks pointer behaviour, BAS evaluates mouse movement and clicks alongside typing. Send `MOUSE_MOVEMENT` and `MOUSE_CLICK` events in the same `interactionData` array as keystrokes. See the [Behavior Tracking guide](/api-reference/others/behavior-tracking) for a sample implementation.

**How scoring works**

* ReDem scores typing and mouse behaviour separately.
* The **lower** score is used for the BAS data point. If both scores are equal, the typing category is used.
* Typing still requires at least **3** keystroke or copy-paste events. Mouse behaviour can be scored on its own when movement or click events are present.
* ReDem only uses the **last 300** `MOUSE_MOVEMENT` and **last 300** `MOUSE_CLICK` events per data point.

**What mouse behaviour is checked**

* Unusually large or instant pointer jumps
* Repeated high-speed teleport-style movement
* Perfectly straight horizontal or vertical movement over longer distances
* Clicks placed at the exact centre of the target element
* Bursts of very rapid clicks

**Categories**

* `NATURAL_MOVEMENT` — mouse behaviour looks human-like (score ≥ 50)
* `UNNATURAL_MOVEMENT` — mouse behaviour looks automated or scripted (score \< 50)

`UNNATURAL_MOVEMENT` is treated like other unnatural BAS categories for cleaning and exclusion.

## How to use the BAS?

The BAS is designed to be used in real-time, via our API, or through survey software with integrated ReDem functionalities. This quality check is not available via the Quick Import.