---
title: delta
description: The page is a detailed guide on how to calculate the percent change of
  a variable using the 'delta' function in the OpenBBTerminal's forecast model. It
  demonstrates how to use the 'openbb.forecast.delta' function through Python code.
keywords:
- delta
- '%change calculation'
- variable change
- forecast model
- openbb.forecast.delta
- target_column
---

import HeadTitle from '@site/src/components/General/HeadTitle.tsx';

<HeadTitle title="forecast.delta - Reference | OpenBB SDK Docs" />

Calculate the %change of a variable based on a specific column

Source Code: [[link](https://github.com/OpenBB-finance/OpenBBTerminal/tree/main/openbb_terminal/forecast/forecast_model.py#L335)]

```python
openbb.forecast.delta(dataset: pd.DataFrame, target_column: str = "close")
```

---

## Parameters

This function does not take any parameters.

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## Returns

This function does not return anything

---