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Secondly, since there is a significant amount of data indicating that religiosity is positively correlated to physical and mental health (see: [[Atheism and health]]). there is the issue of comparing apples to apples and oranges to oranges. Namely, a legitimate question is how much happier are the religious within irreligious countries that have significant Protestant populations, than the irreligious in those same countries.  

Secondly, since there is a significant amount of data indicating that religiosity is positively correlated to physical and mental health (see: [[Atheism and health]]). there is the issue of comparing apples to apples and oranges to oranges. Namely, a legitimate question is how much happier are the religious within irreligious countries that have significant Protestant populations, than the irreligious in those same countries.  

In short, well-designed studies which attempt to form solid conclusions use the principle of [[ceteris paribus]] (all other things remaining equal). This is done by using statistical analysis to isolate variables related to socioeconomic profile of study participants (multiple regression analysis, etc.).

In short, well-designed studies which attempt to form solid conclusions use the principle of [[ceteris paribus]] (all other things remaining equal). This is done by using statistical analysis to isolate variables related to socioeconomic profile of study participants ([[Generalized linear model]] analysis, etc.).

== Notes ==

== Notes ==