text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MODULES //
  
  var constantFunction = require( '@stdlib/utils-constant-function' );
  var betaFactory = require( '@stdlib/stats-base-dists-beta-cdf' ).factory;
  var isnan = require( '@stdlib/math-base-assert-is-nan' );
  var PINF = require( '@stdlib/constants-float64-pinf' );
  
  
  // MAIN //
  
  /**
  * Returns a function for evaluating the cumulative distribution function (CDF) for a beta prime distribution with first shape parameter `alpha` and second shape parameter `beta`.
  *
  * @param {PositiveNumber} alpha - first shape parameter
  * @param {PositiveNumber} beta - second shape parameter
  * @returns {Function} CDF
  *
  * @example
  * var cdf = factory( 0.5, 0.5 );
  *
  * var y = cdf( 0.8 );
  * // returns ~0.465
  *
  * y = cdf( 0.3 );
  * // returns ~0.319
  */
  function factory( alpha, beta ) {
  	var betaCDF;
  	if (
  		isnan( alpha ) ||
  		isnan( beta ) ||
  		alpha <= 0.0 ||
  		beta <= 0.0
  	) {
  		return constantFunction( NaN );
  	}
  	betaCDF = betaFactory( alpha, beta );
  	return cdf;
  
  	/**
  	* Evaluates the cumulative distribution function (CDF) for a beta prime distribution.
  	*
  	* @private
  	* @param {number} x - input value
  	* @returns {Probability} evaluated CDF
  	*
  	* @example
  	* var y = cdf( 2.0 );
  	* // returns <number>
  	*/
  	function cdf( x ) {
  		if ( isnan( x ) ) {
  			return NaN;
  		}
  		if ( x <= 0.0 ) {
  			return 0.0;
  		}
  		if ( x === PINF ) {
  			return 1.0;
  		}
  		return betaCDF( x / ( 1.0 + x ) );
  	}
  }
  
  
  // EXPORTS //
  
  module.exports = factory;
  