A data set of 3 2 4 measurements of an industrial robot's positions are in the robot
Question:
A data set of measurements of an industrial robot's positions are in the robot object in the TSA package. Type library TSA; data robot; print robot in R to see the data set.
a Plot the time series. What basic pattern do you see from the plot? Might a stationary model be appropriate for this plot?
b Using tools such as the ACF, PACF, andor EACF, tentatively specify the type of model AR MA or ARMA as well as the orders of the model.
c Use the best subsets ARMA approach to specify a model. Consider up to AR terms and up to MA terms. Does the "best" subset ARMA model agree with the model you specified in partb
d Repeat parts ac on the first difference of the robot time series. Does this analysis suggest a particular model for the original robot data? Briefly explain.
Statistics Principles And Methods
ISBN: 9780470904114
7th Edition
Authors: Richard A. Johnson, Gouri K. Bhattacharyya