anchor.diff:  <script>
   var categories= ['Culture', 'Instructional Strageties', 'Culture', 'Instructional Strageties'];
   
  -    var rating = [1, 2, 3];
  +    var rating = [1, 2, 3, 4];
   
       var colors = ['#0000b4','#0082ca','#0094ff','#0d4bcf','#0066AE','#074285','#00187B','#285964','#405F83','#416545','#4D7069','#6E9985','#7EBC89','#0283AF','#79BCBF','#99C19E'];
   
  
positive.code:         .tickValues(d3.range(17));
  
      var y_xis = canvas.append('g')
                .attr("transform", "translate(150, 0)")
                .attr('id','yaxis')
                .call(yAxis);
  
  
negative.code:             .range([0,722]);
  
      var yscale = d3.scale.linear()
              .domain([0,categories.length ])
              .range([0,300]);
  
      var colorScale = d3.scale.quantize()
              .domain([0,categories.length])
  