> For the complete documentation index, see [llms.txt](https://docs.sdv.dev/rdt/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sdv.dev/rdt/transformers-glossary/categorical/frequencyencoder.md).

# FrequencyEncoder

{% hint style="danger" %}
***This transformer is deprecated.*** Consider using the [UniformEncoder](/rdt/transformers-glossary/categorical/uniformencoder.md) instead.
{% endhint %}

**Compatibility:** `categorical` data

The `FrequencyEncoder` transforms data that represents unordered, categorical values into decimals in the range `[0, 1]`. This range is broken up into separate intervals for each category -- more popular categories take up larger intervals.

![](/files/asNNqEbpRZMdNbE2Nh4i)

```python
from rdt.transformers.categorical import FrequencyEncoder
fre = FrequencyEncoder()
```

## Parameters

**`add_noise`**: Add noise when transforming a category into the \[0, 1] interval.

<table data-header-hidden><thead><tr><th width="196"></th><th></th></tr></thead><tbody><tr><td>(default) <code>False</code></td><td>Do not add noise. Each time a category appears, it will always be transformed to the same value.</td></tr><tr><td><code>True</code></td><td>Add noise. A category may be transformed to different values every time it appears (but it will always stay within the interval).</td></tr></tbody></table>


---

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