I notice the correlation coefficients there are lowest for retail and services, industries I tend to think of as crappy to work in. That makes me wonder...are c

I notice the correlation coefficients there are lowest for retail and services, industries I tend to think of as crappy to work in. That makes me wonder...are companies behaving rationally and only optimizing for happiness where it matters, or is there a statistical artifact here where they can't find a correlation in industries where every company's workers are miserable.