---
title: root
description: Detailed explanation of OpenBB's econometrics Python library focusing
  on the functionality of unit root tests including ADF and KPSS tests. The page features
  instructions on how to conduct these tests with Python, making it beneficial for
  data analysts and those interested in data series analysis.
keywords:
- Docusaurus
- Econometrics
- ADF test
- KPSS test
- Data series
---

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

<HeadTitle title="econometrics.root - Reference | OpenBB SDK Docs" />

import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';

<Tabs>
<TabItem value="model" label="Model" default>

Calculate test statistics for unit roots

Source Code: [[link](https://github.com/OpenBB-finance/OpenBBTerminal/tree/main/openbb_terminal/econometrics/econometrics_model.py#L168)]

```python
openbb.econometrics.root(data: pd.Series, fuller_reg: str = "c", kpss_reg: str = "c")
```

---

## Parameters

| Name | Type | Description | Default | Optional |
| ---- | ---- | ----------- | ------- | -------- |
| data | pd.Series | Series or column of DataFrame of target variable | None | False |
| fuller_reg | str | Type of regression of ADF test | c | True |
| kpss_reg | str | Type of regression for KPSS test | c | True |


---

## Returns

| Type | Description |
| ---- | ----------- |
| pd.DataFrame | Dataframe with results of ADF test and KPSS test |
---

</TabItem>
<TabItem value="view" label="Chart">

Determine the normality of a timeseries.

Source Code: [[link](https://github.com/OpenBB-finance/OpenBBTerminal/tree/main/openbb_terminal/econometrics/econometrics_view.py#L197)]

```python
openbb.econometrics.root_chart(data: pd.Series, dataset: str = "", column: str = "", fuller_reg: str = "c", kpss_reg: str = "c", export: str = "")
```

---

## Parameters

| Name | Type | Description | Default | Optional |
| ---- | ---- | ----------- | ------- | -------- |
| data | pd.Series | Series of target variable | None | False |
| dataset | str | Name of the dataset |  | True |
| column | str | Name of the column |  | True |
| fuller_reg | str | Type of regression of ADF test. Choose c, ct, ctt, or nc | c | True |
| kpss_reg | str | Type of regression for KPSS test. Choose c or ct | c | True |
| export | str | Format to export data. |  | True |


---

## Returns

This function does not return anything

---

</TabItem>
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