📈 Forecast Regressions

A simple and extensible library for forecasting missing data points using different regression models: Linear, Power, Logarithmic, and Exponential. Designed for PHP 8.1+.

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✨ Features

• 📊 Supports Linear, Power, Logarithmic, and Exponential regression.
• 🔍 Optional interpolation-only mode to avoid extrapolation.
• 🧩 Pluggable architecture via RegressionInterface.
• ⚡️ Fast, simple, and stateless static prediction:
  ForecastService::predict($data, $method)
• ✅ Thoroughly unit-tested.

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📂 Source Code

The complete source code is available on GitHub.

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🛠 Installation

    composer require mykolavuy/forecast-regressions

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🚀 Usage

use MykolaVuy\Forecast\ForecastService;

$data = [
    1 => 10,
    2 => null,
    3 => 30,
    4 => null,
    5 => 50,
    6 => null,
];

$service = new ForecastService();

// Linear regression forecast
$result = $service->forecast($data, method: 'linear');

// Power regression with interpolation only
$interpolated = $service->forecast($data, method: 'power', interpolateOnly: true);

// 🔹 Static call (no instance needed)
$static = ForecastService::predict($data, method: 'exponential');

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🔧 Regression Methods

Method	Formula	Description
linear	y = a * x + b	Straight-line fitting
power	y = a * x^b	Exponential-style growth/decay
logarithmic	y = a + b * log(x)	Logarithmic trend modeling
exponential	y = a * e^(b * x)	Classic exponential regression

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✅ Requirements

• PHP 8.1 or higher
• Composer

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🧪 Running Tests

    ./vendor/bin/phpunit

Test files are located in the tests/ directory.

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📄 License

This project is licensed under the MIT License.

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Thank you for using ForecastRegressions! Contributions and feedback are welcome.