I think the presenter took the data from an earlier study. The numbers on the x scale are categorical.
That’s a good point about SES having a natural upper bound. It’s not really a natural upper bound, because you have to know the population size and choose the number of categories you want in order to see where the mean of your top cluster falls. (Or else you have to plot Bill Gates on your graph.)
I think the presenter took the data from an earlier study. The numbers on the x scale are categorical.
That’s a good point about SES having a natural upper bound. It’s not really a natural upper bound, because you have to know the population size and choose the number of categories you want in order to see where the mean of your top cluster falls. (Or else you have to plot Bill Gates on your graph.)