QQ-plots in R, first need to understand the Q-Q plot. The Q-Q plot is a graphical tool to help us examine if a set of data plausibly came from some theoretical distribution such as a Normal or not.
Suppose, if we are executing a statistical analysis the test comes under parametric methods assumes variable is Normally distributed, we can make use of a Q-Q plot to check that assumption.
It’s just a visual verification, not full proof, so we can make use of some other statistical test also. But Q-Qplot allows us to see at-a-glance if our assumption is valid or not.
Click through to learn more. H/T R-bloggers.