Fits yield curves using Nelson-Siegel (1987)
    <doi:10.1086/296409>, Svensson (1994) <doi:10.3386/w4871>, and cubic
    spline methods. Extracts forward rates, discount factors, and par rates
    from fitted curves. Computes duration and convexity risk measures.
    Computes Z-spread and key rate durations. Provides principal component
    decomposition following Litterman and Scheinkman (1991)
    <doi:10.3905/jfi.1991.692347>, carry and roll-down analysis, and slope
    measures. All methods are pure computation with no
    external dependencies beyond base R; works with yield data from any
    source.

Compute the standard expected years of life lost (YLL),
    as developed by the Global Burden of Disease Study
    (Murray, C.J., Lopez, A.D. and World Health Organization, 1996).
    The YLL is based on comparing the age of death to an external standard life
    expectancy curve. It also computes the average YLL, which highlights premature
    causes of death and brings attention to preventable deaths
    (Aragon et al., 2008).

Convert 'YMD' format number or string to Date efficiently, using Rust's
    standard library. It also provides helper functions to handle Date, e.g., quick
    finding the beginning or end of the given period, adding months to Date, etc.

The Author's personal R Package that contains miscellaneous functions. 
    The current version of package contains miscellaneous functions for brain data 
    to compute Asymmetry Index (AI) and bilateral (L+R) measures and reshape the data.

Write 'YAML' front matter for R Markdown and related
    documents. Work with 'YAML' objects more naturally and write the
    resulting 'YAML' to your clipboard or to 'YAML' files related to your
    project.

Provides a collection of lightweight helper functions (imps) both
  for interactive use and for inclusion within other packages. These include
  functions for minimal input assertions, visualising colour palettes,
  quoting user input, searching rows of a data frame and capturing string
  tokens.