Question 13.40

13.40 MLB batting average.

Consider data on the annual average batting average of all Major League Baseball (MLB) teams of a given year. The data series begins with 1960 and ends with 2013.24

mlb

  1. Make a time plot of the batting average series. Describe any important features of the time series.
  2. Create a lag one variable and plot the batting average of a given year against its lag. Does the plot suggest the use of the lag variable as a possible predictor variable? Explain.
  3. If your software has the option, obtain a PACF for the batting average series. What does the PACF suggest as a possible model to fit to the data?