Problem
Shipments of Household Appliances: Line Graphs. The file ApplianceShipments.csv contains the series of quarterly shipments (in millions of dollars) of US household appliances between 1985 and 1989.
a. Create a well-formatted time plot of the data using R.
b. Does there appear to be a quarterly pattern? For a closer view of the patterns, zoom in to the range of 3500-5000 on the y-axis.
c. Using R, create one chart with four separate lines, one line for each of Q1, Q2, Q3, and Q4. In R, this can be achieved by generating a data. frame for each quarter Q1, Q2, Q3, Q4, and then plotting them as separate series on the line graph. Zoom in to the range of 3500-5000 on the y-axis. Does there appear to be a difference between quarters?
d. Using R, create a line graph of the series at a yearly aggregated level (i.e., the total shipments in each year).