vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/trend/trendClass.php

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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared_Trend
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    ##VERSION##, ##DATE##
 */


require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/linearBestFitClass.php';
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/logarithmicBestFitClass.php';
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/exponentialBestFitClass.php';
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/powerBestFitClass.php';
require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/polynomialBestFitClass.php';


/**
 * PHPExcel_trendClass
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared_Trend
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class trendClass
{
	const TREND_LINEAR				= 'Linear';
	const TREND_LOGARITHMIC			= 'Logarithmic';
	const TREND_EXPONENTIAL			= 'Exponential';
	const TREND_POWER				= 'Power';
	const TREND_POLYNOMIAL_2		= 'Polynomial_2';
	const TREND_POLYNOMIAL_3		= 'Polynomial_3';
	const TREND_POLYNOMIAL_4		= 'Polynomial_4';
	const TREND_POLYNOMIAL_5		= 'Polynomial_5';
	const TREND_POLYNOMIAL_6		= 'Polynomial_6';
	const TREND_BEST_FIT			= 'Bestfit';
	const TREND_BEST_FIT_NO_POLY	= 'Bestfit_no_Polynomials';

	/**
	 * Names of the best-fit trend analysis methods
	 *
	 * @var string[]

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