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* @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 incrcount = require( '@stdlib/stats/incr/count' );
var incrmax = require( '@stdlib/stats/incr/max' );
var incrmin = require( '@stdlib/stats/incr/min' );
var incrrange = require( '@stdlib/stats/incr/range' );
var incrmidrange = require( '@stdlib/stats/incr/midrange' );
var incrsum = require( '@stdlib/stats/incr/sum' );
var incrmean = require( '@stdlib/stats/incr/mean' );
var incrvariance = require( '@stdlib/stats/incr/variance' );
var incrstdev = require( '@stdlib/stats/incr/stdev' );
var incrskewness = require( '@stdlib/stats/incr/skewness' );
var incrkurtosis = require( '@stdlib/stats/incr/kurtosis' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a statistical summary.
*
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrsummary();
*
* var summary = accumulator();
* // returns {}
*
* summary = accumulator( 2.0 );
* // returns {...}
*
* summary = accumulator( -5.0 );
* // returns {...}
*
* summary = accumulator();
* // returns {...}
*/
function incrsummary() {
var midrange;
var variance;
var skewness;
var kurtosis;
var summary;
var count;
var range;
var stdev;
var mean;
var max;
var min;
var sum;
// Incremental count:
count = incrcount();
// Sum:
sum = incrsum();
// Sample mean:
mean = incrmean();
// Unbiased sample variance:
variance = incrvariance();
// Corrected sample standard deviation:
stdev = incrstdev();
// Corrected sample skewness:
skewness = incrskewness();
// Corrected excess sample kurtosis:
kurtosis = incrkurtosis();
// Maximum value:
max = incrmax();
// Minimum value:
min = incrmin();
// Range (i.e., max-min):
range = incrrange();
// Mid-range:
midrange = incrmidrange();
// Initial an object for tracking state:
summary = {};
return accumulator;
/**
* If provided a value, the accumulator function returns an updated summary. If not provided a value, the accumulator function returns the current summary.
*
* @private
* @param {number} [x] - new value
* @returns {Object} summary
*/
function accumulator( x ) {
if ( arguments.length === 0 ) {
return summary;
}
summary.count = count( x );
summary.max = max( x );
summary.min = min( x );
summary.range = range( x );
summary.midrange = midrange( x );
summary.sum = sum( x );
summary.mean = mean( x );
summary.variance = variance( x );
summary.stdev = stdev( x );
summary.skewness = skewness( x );
summary.kurtosis = kurtosis( x );
return summary;
}
}
// EXPORTS //
module.exports = incrsummary;
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