Source: Federal Deposit Insurance Corporation  

Release: National Rates and Rate Caps - Monthly Update  

Units:  Percent, Not Seasonally Adjusted

Frequency:  Weekly, As of Monday

Notes:

The national rate is calculated by the FDIC as a simple average of rates paid (uses annual percentage yield) by all insured depository institutions and branches for which data are available. Data used to calculate the national rates are gathered by RateWatch.
Savings and interest checking account rates are based on the $2,500 product tier while money market and certificate of deposit are based on the $10,000 and $100,000 product tiers for non-jumbo and jumbo accounts, respectively. Account types and maturities are those most commonly offered by the banks and branches for which data is available- no fewer than 49,000 locations and as many as 81,000 locations reported. The deposit rates of credit unions are not included in the calculation.(http://www.fdic.gov/regulations/resources/rates/)

For more information, see the FDIC's Financial Institution Letter FIL-25-2009 issued on May 29, 2009 at http://www.fdic.gov/news/news/financial/2009/fil09025.html.

Source: U.S. Bureau of Labor Statistics  

Release: Consumer Price Index  

Units:  Index 1982-1984=100, Seasonally Adjusted

Frequency:  Monthly

Notes:

The Consumer Price Index for All Urban Consumers: All Items (CPIAUCSL) is a price index of a basket of goods and services paid by urban consumers. Percent changes in the price index measure the inflation rate between any two time periods. The most common inflation metric is the percent change from one year ago. It can also represent the buying habits of urban consumers. This particular index includes roughly 88 percent of the total population, accounting for wage earners, clerical workers, technical workers, self-employed, short-term workers, unemployed, retirees, and those not in the labor force.

The CPIs are based on prices for food, clothing, shelter, and fuels; transportation fares; service fees (e.g., water and sewer service); and sales taxes. Prices are collected monthly from about 4,000 housing units and approximately 26,000 retail establishments across 87 urban areas. To calculate the index, price changes are averaged with weights representing their importance in the spending of the particular group. The index measures price changes (as a percent change) from a predetermined reference date. In addition to the original unadjusted index distributed, the Bureau of Labor Statistics also releases a seasonally adjusted index. The unadjusted series reflects all factors that may influence a change in prices. However, it can be very useful to look at the seasonally adjusted CPI, which removes the effects of seasonal changes, such as weather, school year, production cycles, and holidays.

The CPI can be used to recognize periods of inflation and deflation. Significant increases in the CPI within a short time frame might indicate a period of inflation, and significant decreases in CPI within a short time frame might indicate a period of deflation. However, because the CPI includes volatile food and oil prices, it might not be a reliable measure of inflationary and deflationary periods. For a more accurate detection, the core CPI (CPILFESL) is often used. When using the CPI, please note that it is not applicable to all consumers and should not be used to determine relative living costs. Additionally, the CPI is a statistical measure vulnerable to sampling error since it is based on a sample of prices and not the complete average.

For more information on the consumer price indexes, see:
Bureau of Economic Analysis. "CPI Detailed Report." 2013.
Handbook of Methods
Understanding the CPI: Frequently Asked Questions