time-to-botec

Benchmark sampling in different programming languages
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skewness-test.js (1087B)

      1 var vows = require('vows');
      2 var assert = require('assert');
      3 var suite = vows.describe('jStat.skewness');
      4 
      5 require('../env.js');
      6 
      7 suite.addBatch({
      8   'skewness': {
      9     'topic': function() {
     10       return jStat;
     11     },
     12     'returns accurate skewness value': function(jStat) {
     13       // from normal distribution in R: > rnorm(12); skewness(set) => -0.03270
     14       var set =
     15           [-0.28157961, -0.75577350,  0.61554139,  0.26864022, -0.42703435,
     16            -0.99927791, -0.07113527, -1.39327183,  0.34871138,  1.17909042,
     17            -0.22951562,  0.22341714];
     18       var skew = jStat.skewness(set);
     19 
     20       assert.isTrue(skew > -0.03271);
     21       assert.isTrue(skew < -0.03269);
     22     },
     23     'skewness from instance': function(jStat) {
     24       var set =
     25           [-0.28157961, -0.75577350,  0.61554139,  0.26864022, -0.42703435,
     26            -0.99927791, -0.07113527, -1.39327183,  0.34871138,  1.17909042,
     27            -0.22951562,  0.22341714];
     28       var skew = jStat(set).skewness();
     29 
     30       assert.isTrue(skew > -0.03271);
     31       assert.isTrue(skew < -0.03269);
     32     }
     33   }
     34 });
     35 
     36 suite.export(module);