spearman

来源：互联网发布：七天网络学生空间编辑：程序博客网时间：2024/06/03 17:20

使用JavaScript实现的计算Spearman 相关性系数的函数

'use strict';var DEBUG = 0;module.exports = function( ) {    this.spearman = function( x, y )    {         // Checking parameters        if( undefined == typeof( x ) )        {             return;         }        if( undefined == typeof( y ) )        {             return;         }        var len_x = x.length;        var len_y = y.length;        var len = len_x < len_y ? len_x : len_y;        if( len <= 0 )        {             return;        }        var x_mean = 0.0;        var y_mean = 0.0;        for(var i = 0; i < len; i++ )        {             x_mean += parseFloat(x[i]);             y_mean += parseFloat(y[i]);        }        x_mean = x_mean / len;        y_mean = y_mean / len;        var tmp_u = 0.0 ;        for(var i = 0; i < len; i++ )        {             tmp_u += (x_mean - x[i]) * (y_mean - y[i]);        }        //console.log( 'tmp_u =', tmp_u );        var tmp_d_x = 0.0;        for(var i = 0; i < len; i++ )        {             tmp_d_x += (x_mean - x[i]) * (x_mean - x[i]);        }        var tmp_d_y = 0.0;        for(var i = 0; i < len; i++ )        {             tmp_d_y += (y_mean - y[i]) * (y_mean - y[i]);        }        var rho = tmp_u /Math.sqrt( tmp_d_x * tmp_d_y )if( DEBUG ){     console.log('             Report   ')    console.log('-------------------------------')    console.log( '    Data Set Number =', len  );    console.log( '    Mean Vaule of X =', x_mean  );    console.log( '    Mean Vaule of Y =', y_mean  );    console.log( 'Spearman cor of X-Y =', rho  );}         return rho;    }}

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