crossfilter to do word frequency - d3.js

Question

I would like a crossfilter group that gives the word frequency and average rating for each word in a series of surveys so that I can make an awesome interactive word-bubble-frequency chart.
My data looks like:
[{feedback: "This is a horrible service", rating:2},
{feedback: "I love everything about everything", rating: 10},
{feedback: "love the user interface, good service", rating:6},
{feedback: "", rating: 7} ]
I would like something like:
[ {key: love, count:2, ave: 8}, {key: horrible, count:1, rating:2 }, {key: service,
count: 2, rating: 4 } ,.... ]
So far I have:
function to break up string into tokens, returns object with frequency for each word
var wordcnt = function(bah ){
var hist = {}, words = bah.split(/[\s*\.*\,\;\+?\#\|:\-\/\\\[\]\(\)\{\}$%&0-9*]/)
for( var i in words)
if(words[i].length >1 )
hist[words[i]] ? hist[words[i]]+=1 : hist[words[i]]=1;
return hist;
};
Loading data into d3 and crossfilter
d3.csv("test.csv", function( error, data) {
data.forEach(function(d) {
d.rating= +d.rating;
d.wordCount= wordcnt(d.feedback.toLowerCase());
});
var ndx = crossfilter(data);
var all = ndx.groupAll();
var frequencyDimension=ndx.dimension(function(d){return d.wordCount; });
And one butchered group reduce function!
var frequencyGroup= frequencyDimension.group().reduce(
function (p, v) {
for (var key in v.wordCount) {
if (v.frequency.hasOwnProperty(key)) {
p.frequency[key]+= v[key];
p.frequency[key].count++;
p.frequency[key].sum+= v.rating ;
}
else{
p.frequency[key]=v[key];
p.frequency[key].count=1;
p.frequency[key].sum = v.rating;
}
}
p.frequency[key].ave = p.frequency[key].sum/p.frequency[key].count ;
return p;
},
function (p, v) {
for (var key in v.wordCount) {
if (v.frequency.hasOwnProperty(key)) {
p.frequency[key]-= v[key];
p.frequency[key].count--;
p.frequency[key].sum-= v.rating ;
}
//don't need an else statement because can't remove key if it doesn't exist
}
p.frequency[key].ave = p.frequency[key].sum/p.frequency[key].count ;
return p;
},
function (p,v) {
return { frequency: {} } ;
}
)