tVaRPlot3D function

Plots t VaR against confidence level and holding period

Plots the VaR of a portfolio against confidence level and holding period assuming that P/L are t distributed, for specified confidence level and holding period.

tVaRPlot3D(...)

Arguments

• ...: The input arguments contain either return data or else mean and standard deviation data. Accordingly, number of input arguments is either 4 or 5. In case there 4 input arguments, the mean and standard deviation of data is computed from return data. See examples for details.

  returns Vector of daily geometric return data

  mu Mean of daily geometric return data

  sigma Standard deviation of daily geometric return data

  df Number of degrees of freedom in the t distribution

  cl VaR confidence level and must be a vector

  hp VaR holding period and must be a vector

Examples

# Plots VaR against confidene level given geometric return data
   data <- runif(5, min = 0, max = .2)
   tVaRPlot3D(returns = data, df = 6, cl = seq(.85,.99,.01), hp = 60:90)

   # Computes VaR against confidence level given mean and standard deviation of return data
   tVaRPlot3D(mu = .012, sigma = .03, df = 6, cl = seq(.85,.99,.02), hp = 40:80)

Author(s)

Dinesh Acharya

References

Dowd, K. Measuring Market Risk, Wiley, 2007.