The Federal Reserve carefully reviews and analyzes the available inflation measures to monitor how well it is achieving its price stability goal. One common way economists use inflation data is by looking at “core inflation,” which is generally defined as a chosen measure of inflation (e.g., the Consumer Price Index or CPI, the Personal Consumption Expenditures Price Index or PCEPI, or the Gross Domestic Product Deflator) that excludes the more volatile categories of food and energy prices.