Fig. 4: Polar plots for demographic factors within NASA astronaut groups defined by k-means clustering.
From: A demographic comparison of NASA astronauts and commercial spaceflight participants
A shows each group’s scores separately, while B combines them on a common grid. Values of variables are either prevalence (sex, military, pilot) or values scaled to a normal distribution with mean = 0 and SD = 1 (age, education, year).
