Problem One. Download from the Canvas site and load into Stata the dataset CPI. Inform Stata about the timing in this data with the command tsset numdate. Now create a "return\" variable that measures the year on year change in the Consumer Price Index (CPI) with the command gen ination = (cpi L12.cpi)/L12.cpi. (L12 in this situation means we are using the lagged value from 12 time periods ago. As our data is in monthly frequency, it is a) According to this new variable, what is the year on year inflation in the CPI as of Oct 1, 2022? b) When the variable inflation was generated, it created 12 missing values. Where are those missing values and why are they missing