In addition to the usual CPI, the BLS also calculates a CPI that does not include the
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a. Locate the data for the Consumer Price Index (CPIAUCSL) and the Consumer Price Index less Food and Energy (CPILFESL). Click on the "Download Data" link on the left of the page. Change the beginning date to 2006-07-01. You can leave the ending date as it is. Then click on the "Download Data" button to download the data and save it to your computer. Finally, open the Excel file that you just downloaded. (Note: You can also use another compatible spreadsheet program, such as Open Office's Calc.)
b. Using Excel, calculate the percentage change in each CPI from a year ago for each of the observations, beginning with the observation 2007-07-01. To make this calculation, click on the blank cell next to the observation corresponding to 2007-07-01, and then enter the following formula (note that in Excel, the symbol for multiplication is *):
where t1 = 2007-07-01 and t = 2006-07-01. Repeat this process for the remaining observations. (You can use the copy and paste functions to avoid having to retype the formula.)
c. Using your calculations from part (b), create a graph of the percentage changes from a year ago for both indexes. Make sure both data lines are on the same graph.
d. Discuss differences between the two measures of the inflation rate. For instance, from your calculations, what was the inflation rate in June 2009 using the two CPI measures?
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