By this I mean, Capitalism says Capitalism means Free Markets, but it doesn't. US says they are for freedom, democracy, but they aren't. Just reading something doesn't make it true.
Also, it seems like capitalist countries have freer markets than communist/socialist ones. Though you’d have to give examples of communist/socialist countries.
Generally they have many categories. Rate the market conditions on a scale (some of the measures are quantitative). Average the ratings together to get one number comparing countries