Counting Checked Radio Buttons with jQuery

I have pages with varying numbers of radio buttons. These buttons have two different classes, `yes`, and `no`. As the user goes down the page, I need to figure out how many of each class they have selected, and display it in a `

` at the bottom of the page. I'm having problems preventing 1 getting added to the variable when a user clicks on a radio button more than once. Here's a JS fiddle with my code: It's not working at all for some reason, and I don't see why.

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