| convexity | Calculate the convexity of a bond |
| get_yields | Load data from FRED |
| mod_duration | Calculate the modified duration of a bond |
| tibble_to_xts | Convert a tibble data frame to an xts object |
| total_return | Calculate bond total returns from constant-maturity yield data |
| xts_to_tibble | Convert an xts object to a tibble data frame |