# Numeric (decimal)

Below is a list of available numeric (decimal) mask functions.

## **Numeric Noise**

Adds noise to numeric data based on a uniform distribution, ensuring that the values are randomized while preserving the overall structure of the dataset. This is useful for anonymizing numerical fields where consistency and distribution must be maintained.

#### **Parameters**

* `Maximum negative noise`: The smallest amount the date can be adjusted, relative to the original date.
  * Use negative numbers to shift the date into the past.
    * Example: If the date part is set to "Day" and the minimum shift is set to `-5`, this ensures the date will not be shifted earlier than 5 days prior to the original date.
    * A positive number shifts the date forward.
    * Example: If the minimum shift is `5`, the date will not shift earlier than 5 days after the original date.
* `Maximum positive noise`: The largest amount by which the date can be adjusted from the original value.
  * Use positive numbers to shift the date into the future.
    * Example: If the date part is set to "Day" and the maximum shift is set to `5`, the date will not be shifted later than 5 days after the original date.
* `Noise type`: The unit of time (Additive, Multiplicative, Absolute) that will define the granularity of the shift.
  * Additive: If the data has a value of x, we will add random noise within the range -10% to +10% of x's absolute value.
  * Multiplicative: Multiply the value by a random factor within the range -5 to 5.
  * Absolute: Add direct random noise to the value within the range from -5 to 5.
  * The selected unit will be applied to both the minimum and maximum shift fields
* `Consistent mapping`: Numeric Noise supports [consistent mapping](https://docs.syntho.ai/configure-a-data-generation-job/configure-column-settings/consistent-mapping).

#### **Example** <a href="#example---shifting-a-set-of-dates" id="example---shifting-a-set-of-dates"></a>

If you configure:

```
Maximum negative noise: 3
Maximum positive noise: 3
Noise type: Absolute

2173,
2090,
2227,
...
```

The results will be:

```
2170,
2088,
2227,
...
```

<figure><img src="https://content.gitbook.com/content/U61B9DqtWCNO3Z30vnjh/blobs/qcdpQWOEcinpi7UYEUJj/image.png" alt="" width="525"><figcaption><p>Numeric Noise</p></figcaption></figure>