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* @license Apache-2.0
*
* Copyright (c) 2026 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 isnan = require( '@stdlib/math/base/assert/is-nan' );
var sin = require( '@stdlib/math/base/special/sin' );
var PI = require( '@stdlib/constants/float64/pi' );
// MAIN //
/**
* Returns the mean of a log-logistic distribution with scale parameter `alpha` and shape parameter `beta`.
*
* @param {PositiveNumber} alpha - scale parameter
* @param {PositiveNumber} beta - shape parameter
* @returns {PositiveNumber} mean
*
* @example
* var y = mean( 1.0, 2.0 );
* // returns ~1.571
*
* @example
* var y = mean( 4.0, 3.0 );
* // returns ~4.837
*
* @example
* var y = mean( 1.0, 1.0 );
* // returns NaN
*
* @example
* var y = mean( NaN, 2.0 );
* // returns NaN
*
* @example
* var y = mean( 2.0, NaN );
* // returns NaN
*
* @example
* var y = mean( -1.0, 2.0 );
* // returns NaN
*
* @example
* var y = mean( 2.0, -1.0 );
* // returns NaN
*/
function mean( alpha, beta ) {
if (
isnan( alpha ) ||
isnan( beta ) ||
alpha <= 0.0 ||
beta <= 0.0
) {
return NaN;
}
if ( beta <= 1.0 ) {
return NaN;
}
return alpha * ( PI / beta ) / sin( PI / beta );
}
// EXPORTS //
module.exports = mean;
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