User blog comment:Thecheme/Odds of opening a specific rarity of card based on chest and arena./@comment-27028362-20160130001514/@comment-10955477-20160130051657

The information is a community project spearheaded by Thecheme, which collects various data on the amount of Gold, Gems & Common/Rare/Epic cards per Chest, from Arena 1-Arena 6, by a survey.

Feel free to contribute yourself :)