Canada

A set of 73 country attributes

an online survey [...] total of 17,195 individuals from 36 countries. Of the respondents, 8,267 were informed elites, 4,622 were business decision-makers and 7,402 were considered general public (43%). Survey participants were given a random subset of countries and country attributes to consider: about half of the attributes for roughly a third of the countries.

Participants assessed whether they associated an attribute with a nation. The more a country was perceived to exemplify a certain characteristic in relation to the average, the higher that country's attribute score.

Attributes were grouped into 10 thematic subrankings. Subranking scores for each country were determined by averaging the scores that country received in each of the attributes comprising that subranking.

To determine the weight each subranking score had in the overall Best Countries score, using correlation with GDP(PPP) per capita [...] a stronger relationship weighted more heavily: Entrepreneurship (14.13%), Quality of Life (14.12%), Agility (14.02%), Social Purpose (12.83%), Movers (11.54%), Cultural Influence (10.44%), Open for Business (9.43%), Adventure (5.37%), Power (5.00%), Heritage (3.13%).

The math sounds alright. My main gripe would be that it's survey-based (so highly affected by biased perceptions) and that an attribute impact in the overall ranking is dictated by its correlation with wealth, which is kinda arbitrary - and bleak. Great things like "friendly, fun, good for tourism, pleasant climate, scenic" (Adventure) and "culturally accessible, has a rich history, has great food, many cultural attractions, many geographical attractions" (Heritage) are heavily discounted.

To be honest, the only category of attributes I care about in this methodology are in the realm of Quality of Life (Canada #3), but I still find it wildly arbitrary that "good job market" is QoL but things like "pleasant climate" and "good food" are not. Anyway, the top 20 in QoL are the usual suspects, so I don't really care about minor changes in relative position between these - lol at US #23.