Here’s the simplest explanation of Simpson’s paradox that I know: take any two variables that are positively correlated, for example height and weight. Now consider all people whose height in cm + weight in kg equals 250. In that group, height and weight are negatively correlated. But all people can be divided into such groups :-)
Here’s the simplest explanation of Simpson’s paradox that I know: take any two variables that are positively correlated, for example height and weight. Now consider all people whose height in cm + weight in kg equals 250. In that group, height and weight are negatively correlated. But all people can be divided into such groups :-)
Nice, I’d neither heard nor thought of this framing before. Thanks!