Top box

I'm in the process of migrating articles from an internal wiki to a new platform (I much prefer the one we're leaving, and I prefer MediaWiki to both, but it's not my call). Anyway, I stumbled over an entry that I wrote a few months ago about top box and bottom box statistics. Top box analysis, as far as I can tell, is fairly popular in the market research industry. It's often used with measures of customer satisfaction. It's a simple tool, but it hasn't received a lot of rigorous academic attention, so there isn't a lot of information available online. And, unfortunately, the only way to search for it is with "top box -office -set".