=+32. Consumer price index 2013. The most common use of the CPI is as an economic indicator to forecast inflation and evaluate the effectiveness of government policies.

Following is the time series plot for the monthly CPI

(not seasonally adjusted) from January 2007 to May 2013.

The linear trend line is: CPI = 206 + 0.346 t, where t = 0, 1, c 76 to represent the months in the series. CPI 210 2007 Year 220 230 2009 2011 2013