If you are looking to view these values in the console then you can use this print_filter function that was mentioned in the tutorial!
(http://www.codeproject.com/Articles/693841/Making-Dashboards-with-Dc-js-Part-1-Using-Crossfil)
Basically you would include this bit of code in your javascript rendering of the crossfilter charts before you define your data source or your ndx variable:
function print_filter(filter) {
var f = eval(filter);
if (typeof(f.length) != "undefined") {}else{}
if (typeof(f.top) != "undefined") {f=f.top(Infinity);}else{}
if (typeof(f.dimension) != "undefined") {f=f.dimension(function(d) { return "";}).top(Infinity);}else{}
console.log(filter+"("+f.length+") = "+JSON.stringify(f).replace("[","[\n\t").replace(/}\,/g,"},\n\t").replace("]","\n]"));
};
Then you can simply run print_filter(scoreDim) in your console! It's that simple! You can use this to see all of the objects you create using crossfilter including groups, etc.
Hope this helps!