> For the complete documentation index, see [llms.txt](https://docs.rasgoml.com/rasgo-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rasgoml.com/rasgo-docs/rasgo-0.1/all-transforms/train_test_split.md).

# Train Test Split

Label rows as part of the train or test set based off of percentage split you want to apply to the data.

If you want a row-wise random sample applied, do not pass an order\_by column. If you want an ordered split, then pass the order\_by column.

## Parameters

| Name           | Type         | Description                                                                                                                                              | Is Optional |
| -------------- | ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------- |
| order\_by      | column\_list | Optional argument that affects the train/test split method applied. if needed, pass the names of column(s) you want to order by when applying the split. | True        |
| train\_percent | int          | Percent of the data you want in the train set, expressed as a decimal (i.e. .8). The rest of the rows will be included in the test set.                  |             |

## Example

```python
ds = rasgo.get.dataset(id)

ds2 = ds.train_test_split(order_by = ['DATE'],
    train_percent = 0.8)
ds2.preview()

ds2b = ds.train_test_split(train_percent = 0.8)
ds2b.preview()
```

## Source Code

{% embed url="<https://github.com/rasgointelligence/RasgoTransforms/blob/main/rasgotransforms/rasgotransforms/transforms/train_test_split/train_test_split.sql>" %}


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