Here is a table that I used in my sample lecture to illustrate Simpson’s Paradox (in this case, two hospitals arguing about which one is better at curing patients).
(Well, in my original table there are borders between the columns too, but I haven’t worked out how to do that in WordPress yet! Hopefully the columns are clear enough anyway?)
In the following table, percentages have been rounded to the nearest integer
|Male patients||Female patients||All patients|
|Hospital A||1 patient
|Hospital B||90 patients
For more on this phenomenon, look up Simpson’s Paradox.
Situations like this really do turn up surprisingly often!