👉 Rarenesses are a type of statistical measure used in econometrics to quantify how much variation is explained by an explanatory variable. It is named after the concept of rarity, which refers to the rarity or lack of variety in a population. In econometrics and statistics, rarenesses are often calculated as the ratio of the number of times that a particular value occurs compared to the total number of values observed for that variable. The calculation is based on the idea that a large number of observations tends to