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pca: A Python Package for Principal Component Analysis.

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###

<div>

<a href="https://erdogant.github.io/pca/"><img src="https://github.com/erdogant/pca/blob/master/docs/figs/iris_density.png" width="175" align="left" /></a>
``pca`` is a Python package for Principal Component Analysis. The core of PCA is built on sklearn functionality to find maximum compatibility when combining with other packages.
But this package can do a lot more. Besides the regular PCA, it can also perform SparsePCA, and TruncatedSVD. Depending on your input data, the best approach can be chosen.
``pca`` contains the most-wanted analysis and plots. Navigate to [API documentations](https://erdogant.github.io/pca/) for more detailed information. **⭐️ Star it if you like it ⭐️**
</div>

---

### Key Features

| Feature | Description | Docs | Medium | Gumroad & Podcast |
|---------|-------------|----------------------|--------|---------|
| **Fit and Transform** | Perform the PCA analysis. | [Link](https://erdogant.github.io/pca/pages/html/Algorithm.html) | [PCA Guide](https://medium.com/data-science-collective/pca-fb6ea1208bda) | [Link](https://erdogant.gumroad.com/l/PCA) |
| **Biplot and Loadings** | Make Biplot with the loadings. | [Link](https://erdogant.github.io/pca/pages/html/Plots.html#biplot) | – | – |
| **Explained Variance** | Determine the explained variance and plot. | [Link](https://erdogant.github.io/pca/pages/html/Plots.html#explained-variance-plot) | – | – |
| **Best Performing Features** | Extract the best performing features. | [Link](https://erdogant.github.io/pca/pages/html/Algorithm.html#best-performing-features) | – | – |
| **Scatterplot** | Create scatterplot with loadings. | [Link](https://erdogant.github.io/pca/pages/html/Plots.html#scatter-plot) | – | – |
| **Outlier Detection** | Detect outliers using Hotelling T2 and/or SPE/Dmodx. | [Link](https://erdogant.github.io/pca/pages/html/Outlier%20detection.html) | [Outlier Detection](https://medium.com/data-science-collective/outlier-detection-using-principal-component-analysis-with-hotellings-t2-and-spe-dmodx-methods-c9c0c76cc6c7) | [Link](https://erdogant.gumroad.com/l/outlier-detection-using-principal-component-analysis-with-hotellings-t2-and-spe-dmodx-methods-c9c0c76cc6c7) |
| **Normalize out Variance** | Remove any bias from your data. | [Link](https://erdogant.github.io/pca/pages/html/Examples.html#normalizing-out-pcs) | – | – |
| **Save and load** | Save and load models. | [Link](https://erdogant.github.io/pca/pages/html/save.html) | – | – |
| **Analyze discrete datasets** | Analyze discrete datasets. | [Link](https://erdogant.github.io/pca/pages/html/Examples.html#analyzing-discrete-datasets) | – | – |

---

### Resources and Links
- **Example Notebooks:** [Examples](https://erdogant.github.io/pca/pages/html/Documentation.html#colab-notebook)
- **Medium Blogs** [Medium](https://erdogant.github.io/pca/pages/html/Documentation.html#medium-blogs)
- **Gumroad Blogs with podcast:** [GumRoad](https://erdogant.github.io/pca/pages/html/Documentation.html#gumroad-products-with-podcasts)
- **Documentation:** [Website](https://erdogant.github.io/pca)
- **Bug Reports and Feature Requests:** [GitHub Issues](https://github.com/erdogant/pca/issues)

---

## Installation

```bash
pip install pca
```

```python
from pca import pca
```

---
## Examples

<tr>
    <th><a href="https://erdogant.github.io/pca/pages/html/Examples.html">Quick Start</a></th>
    <th><a href="https://erdogant.github.io/pca/pages/html/Plots.html#biplot">Make Biplot</a></th>
  </tr>
  <tr>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Examples.html">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/fig_scatter.png?raw=true" width="400" />
      </a>
    </td>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Plots.html#biplot">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/custom_example_2.png?raw=true" width="350" />
      </a>
    </td>
  </tr>

<tr>
    <th><a href="https://erdogant.github.io/pca/pages/html/Plots.html#explained-variance-plot">Explained Variance Plot</a></th>
    <th><a href="https://erdogant.github.io/pca/pages/html/Plots.html#d-plots">3D Plots</a></th>
  </tr>
  <tr>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Plots.html#explained-variance-plot">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/fig_plot.png" width="350" />
      </a>
    </td>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Plots.html#d-plots">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/iris_3d_density.png" width="350" />
      </a>
    </td>
  </tr>

<tr>
    <th><a href="https://erdogant.github.io/pca/pages/html/Plots.html#alpha-transparency">Alpha Transparency</a></th>
    <th><a href="https://erdogant.github.io/pca/pages/html/Algorithm.html#normalizing-out-pcs">Normalize Out Principal Components</a></th>
  </tr>
  <tr>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Plots.html#alpha-transparency">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/fig_scatter.png" width="350" />
      </a>
    </td>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Algorithm.html#normalizing-out-pcs">
        <img src="https://i.stack.imgur.com/Wb1rN.png" width="350" />
      </a>
    </td>
  </tr>

<tr>
    <th colspan="2"><a href="https://erdogant.github.io/pca/pages/html/Examples.html#feature-importance">Extract Feature Importance</a></th>
  </tr>
  <tr>
    <td colspan="2">
      Make the biplot to visualize the contribution of each feature to the principal components.
      <br/><br/>
      <a href="https://i.stack.imgur.com/V6BYZ.png">
        <img src="https://i.stack.imgur.com/V6BYZ.png" width="350" />
      </a>
      <a href="https://i.stack.imgur.com/831NF.png">
        <img src="https://i.stack.imgur.com/831NF.png" width="350" />
      </a>
    </td>
  </tr>

<tr>
    <th><a href="https://erdogant.github.io/pca/pages/html/Outlier%20detection.html">Detect Outliers</a></th>
    <th><a href="https://erdogant.github.io/pca/pages/html/Plots.html#biplot-only-arrows">Show Only Loadings</a></th>
  </tr>
  <tr>
    <td align="left">
      Detect outliers using Hotelling's T² and Fisher’s method across top components (PC1–PC5).
      <br/><br/>
      <a href="https://erdogant.github.io/pca/pages/html/Outlier%20detection.html">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/outliers_biplot_spe_hot.png" width="170" />
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/outliers_biplot3d.png" width="170" />
      </a>
    </td>
    <td align="left">
      <a href="https://erdogant.github.io/pca/pages/html/Plots.html#biplot-only-arrows">
        <img src="https://github.com/erdogant/pca/blob/master/docs/figs/biplot_only_directions.png" width="350" />
      </a>
    </td>
  </tr>

<tr>
    <th><a href="https://erdogant.github.io/pca/pages/html/Outlier%20detection.html#selection-of-the-outliers">Select Outliers</a></th>
    <th><a href="https://erdogant.github.io/pca/pages/html/Plots.html#toggle-visible-status">Toggle Visibility</a></th>
  </tr>
  <tr>
    <td align="left">
      Select and filter identified outliers for deeper inspection or removal.
    </td>
    <td align="left">
      Toggle visibility of samples and components to clean up visualizations.
    </td>
  </tr>

<tr>
    <th colspan="2"><a href="https://erdogant.github.io/pca/pages/html/Examples.html#map-unseen-datapoints-into-fitted-space">Map Unseen Datapoints</a></th>
  </tr>
  <tr>
    <td colspan="2">
      Project new data into the transformed PCA space. This enables testing new observations without re-fitting the model.
    </td>
  </tr>

</table>

---

### Contributors
Setting up and maintaining PCA has been possible thanks to users and contributors. Thanks to:

### Maintainer
* Erdogan Taskesen, github: [erdogant](https://github.com/erdogant)
* Contributions are welcome.
* Yes! This library is entirely **free** but it runs on coffee! :) Feel free to support with a <a href="https://erdogant.github.io/donate/?currency=USD&amount=5">Coffee</a>.

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