And I don't understand why. I'm suspecting it is a namespace issue but the function and its calls are defined within the same doc ready function.
When I try to call the function in the console I get calcPCs is not defined
$(document).ready(function() {
    function calcPCs(id) {
        var si = $(id).find(".Screened-In").text();
        var so = $(id).find(".Screened-Out").text();
        var ref = $(id).find(".Referred").text();
        var ret = $(id).find(".Retained").text();
        $(id).find(".Screened-In").append(' (' + Math.floor((+si / (+si + +so)) * 100) + '%)');
        $(id).find(".Screened-Out").append(' (' + Math.floor((+so / (+si + +so)) * 100) + '%)');
        $(id).find(".Referred").append(' (' + Math.floor((+ref / (+ref + +ret)) * 100) + '%)');
        $(id).find(".Retained").append(' (' + Math.floor((+ret / (+ref + +ret)) * 100) + '%)');
    };            
    calcPCs("#northwest");
    calcPCs("#northeast");
    calcPCs("#west");
    calcPCs("#east");
    calcPCs("#central");
    calcPCs("#gtr");
});
 
     
    