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# Why can't I G studies show a causal relationship between two variables?

Jeremy Wood

in Schools

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#### 1 answer

Tara Andrews on May 2, 2018

Correlation can only show that a variable increases linearly as the other increases or decreases. Can't view the nonlinear relationships. Therefore, to be perfect nin respect of the linear correlation coefficient can be zero. For example y = x 2 on the interval (-a, a) for any positive numbers and, secondly, correlation cannot determine whether the cause of B " or " B " cause A. No, probably a good correlation between my age in the last 10 years, and the number of white hairs on my head. However, I do not think that white hair that made me GROW more (I may seem old, but that's another topic entirely). In addition, if two variables are correlated, no causal relationship between two variables, but there may be a third variable that causes so many. There is a good correlation between age and the number of cars in the UK. Age not to increase the number of cars and number of cars that wouldn't let me grow age. So that there is no causal connection between them. On the contrary, both are interrelated over time.