code: function determineFreqCategories() {
      if (mean - sd < 0) {
        var lowrange = 0 + mean / 3;
      } else {
        var lowrange = mean - sd;
      }
      var midrange = [mean + sd, lowrange];
      var highrange = mean + sd;
  
      var i = 0;
      for (; i < potentialexamples.length; i++) {
        var word = potentialexamples[i][0];
  
        if ('undefined' != typeof wordfreq[word.simplified]) {
          pushFrequency(word);
        }
      }
  
      function pushFrequency(word) {
        if (wordfreq[word.simplified] < lowrange) {
          lowfreq.push(word);
        }
        if (
          wordfreq[word.simplified] >= midrange[1] &&
          wordfreq[word.simplified] < midrange[0]
        ) {
          midfreq.push(word);
        }
        if (wordfreq[word.simplified] >= highrange) {
          highfreq.push(word);
        }
      }
    }
docs: Create frequency categories