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224+ < span class ="cline-any cline-neutral "> </ span > </ td > < td class ="text "> < pre class ="prettyprint lang-js "> /**
225+ * @license Apache-2.0
226+ *
227+ * Copyright (c) 2018 The Stdlib Authors.
228+ *
229+ * Licensed under the Apache License, Version 2.0 (the "License");
230+ * you may not use this file except in compliance with the License.
231+ * You may obtain a copy of the License at
232+ *
233+ * http://www.apache.org/licenses/LICENSE-2.0
234+ *
235+ * Unless required by applicable law or agreed to in writing, software
236+ * distributed under the License is distributed on an "AS IS" BASIS,
237+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
238+ * See the License for the specific language governing permissions and
239+ * limitations under the License.
240+ */
241+
242+ 'use strict';
243+
244+ // MODULES //
245+
246+ var constantFunction = require( '@stdlib/utils/constant-function' );
247+ var isnan = require( '@stdlib/math/base/assert/is-nan' );
248+ var pow = require( '@stdlib/math/base/special/pow' );
249+
250+
251+ // MAIN //
252+
253+ /**
254+ * Returns a function for evaluating the quantile function for a Kumaraswamy's double bounded distribution with first shape parameter `a` and second shape parameter `b`.
255+ *
256+ * @param {PositiveNumber} a - first shape parameter
257+ * @param {PositiveNumber} b - second shape parameter
258+ * @returns {Function} quantile function
259+ *
260+ * @example
261+ * var quantile = factory( 0.5, 0.5 );
262+ *
263+ * var y = quantile( 0.8 );
264+ * // returns ~0.922
265+ *
266+ * y = quantile( 0.3 );
267+ * // returns ~0.26
268+ */
269+ function factory( a, b ) {
270+ if (
271+ isnan( a ) ||
272+ isnan( b ) ||
273+ a <= 0.0 ||
274+ b <= 0.0
275+ ) {
276+ return constantFunction( NaN );
277+ }
278+ return quantile;
279+
280+ /**
281+ * Evaluates the quantile function for a Kumaraswamy's double bounded distribution.
282+ *
283+ * @private
284+ * @param {Probability} p - input probability
285+ * @returns {number} evaluated quantile function
286+ *
287+ * @example
288+ * var y = quantile( 2.0 );
289+ * // returns <number>
290+ */
291+ function quantile( p ) {
292+ if ( isnan( p ) || p < 0.0 || p > 1.0 ) {
293+ return NaN;
294+ }
295+ return pow( 1.0 - pow( 1.0-p, 1.0/b ), 1.0/a );
296+ }
297+ }
298+
299+
300+ // EXPORTS //
301+
302+ module.exports = factory;
303+ </ pre > </ td > </ tr > </ table > </ pre >
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310+ at 2025-06-22T23:02:02.819Z
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