# rriskproc: Simulation of a risk process that is perturbed by a Wiener... In finiteruinprob: Computation of the Probability of Ruin Within a Finite Time Horizon

## Description

This function simulates paths of a compound Poisson risk process that is perturbed by a Wiener process. Multiple paths can be simulated simultaneously.

## Usage

 ```1 2``` ```rriskproc(m = 1001, window = c(0, 1), num = 1, sigma = 1, freq = 1, drift = 0, jumpdist, ...) ```

## Arguments

 `m` Number of sample points for each path `window` Beginning and end of the time window `num` Number of paths to be simulated `sigma` Volatility of the Wiener process `freq` Frequency of the claims `drift` Drift (premium intensity) of the process `jumpdist` A function that returns realizations of the claim distribution `...` Additional arguments for `jumpdist`

## Details

Possible choices for `jumpdist` include `rexp`, `rgamma` and `rlnorm`.

It is assumed that the function specified for `jumpdist` interprets its first argument as the vector length of its return value, i. e. the number of simultaneously generated random variables.

The path realizations of the Wiener process are generated using the circulant embedding method (see references).

## Value

A time-series object/time-series object containing the simulated sample path(s).

## References

Dietrich, C. and Newsam, G. (1997) Fast and Exact Simulation of Stationary Gaussian Processes through Circulant Embedding of the Covariance Matrix. SIAM Journal on Scientific Computing 18(4), pp. 1088-1107

`rhypoexp`
 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18``` ``` require(sdprisk) rriskproc(m = 1001, window = c(0, 5), num = 1, sigma = sqrt(0.4), freq = 1, drift = 2, jumpdist = rhypoexp, rate = c(1, 10)) # The same can be achieved using # jumpdist = function(n) rexp(n, 1) + rexp(n, 10) rriskproc(window = c(0, 10), jumpdist = function(n) { rexp(n, 1) + rexp(n, 10) }) ```