A time series defined by ???????? = 1000 log10(????????), where ???????? is the price of hogs recorded annually by the U.S. Census of Agriculture on January 1 for each of the 82 years, from 1867 to 1948 is listed as Series Q in the Collection of Time Series in Part Five. This is a well-known time series analyzed by Quenouille (1957), and others.

(a) Plot the series. Compute and plot the ACF and PACF of the series.

(b) Identify a time series model for the series.