Intermediate Term Bonds
Intermediate term bond funds generally have an average maturity around 5-7 years. The returns on the site use a 10-1 model that mirrors popular Bloomberg Barclays index methodology.
While there are many different types of bonds, the most important feature that generally drives comparative returns is the credit quality. The calculations here are all based on the highest quality bonds issued by the treasury of the country in question. While unique in their own right, they are also generally a good proxy for total bond market funds.
Treasury bonds are generally considered the safest form of bond, since because the government can always print more money there’s virtually no default risk.