library(astsa) data(cmort) data(tempr) data(part) pairs(cbind(Mortality=cmort, Temperature=tempr, Particulates=part))
The author mentioned in his book – Page 46 that "Note the curvilinear shape of the temperature mortality curve, indicating that higher temperatures as well as lower temperatures
are associated with increases in cardiovascular mortality."
Am I reading the scatterplot incorrectly or what.. I just cannot make sense of what the author said…