如何确立因果关系的标准有三个。第一个必要条件是在时序上，先有因后有果。

如何确立因果关系的标准有三个。第一个必要条件是在时序上，先有因后有果。第二个必要条件是，两个变量之间具有实证相关性。第三个必要条件是两个变量间的实证相关不因为第三个变量的存在。

結果 (英文) 1:

How to establish the standard of causation has three. First prerequisite is chronologically, because after the first fruit. The second necessary condition is that has a positive correlation between the two variables. The third prerequisite is an empirical correlation between two variables does not because of the existence of a third variable.

結果 (英文) 2:

How to establish a causal relationship there are three criteria. The first is a necessary condition in the timing, after the first due to fruit. The second requirement is that having the empirical correlation between the two variables. The third requirement is the empirical correlation between two variables does not exist because the third variable.

結果 (英文) 3:

How to establish a causal relationship between the three criteria. The first necessary condition is in the sequence, the first because after the fruit. The second necessary condition is that the two variables have the positive correlation. The third necessary condition is that the empirical correlation between the two variables is not because of the existence of third variables.