The data file named robot contains a time series obtained from an industrial robot. The robot was put through a sequence of maneuvers, and the distance from a desired ending point was recorded in inches. This was repeated 324 times to form the time series.
Type library(TSA) ; data(robot) ; print(robot) to see the data.
Display the time series plot of the data. Based on this information, do these data appear to come from a stationary or nonstationary process?