Description Usage Arguments Details Value Author(s) References See Also Examples

The `pfNonlinBS`

function provides a simple example for
RcppSMC. It is a simple “bootstrap” particle filter which employs
multinomial resampling after each iteration applied to the ubiquitous "nonlinear
state space model" following Gordon, Salmond and Smith (1993).

1 | ```
pfNonlinBS(data, particles=500, plot=FALSE)
``` |

`data` |
A vector variable containing the sequence of observations. |

`particles` |
An integer specifying the number of particles. |

`plot` |
A boolean variable describing whether a plot should illustrate the (posterior mean) estimated path along with one and two standard deviation intervals. |

The `pfNonlinbs`

function provides a simple example for
RcppSMC. It is based on a simple nonlinear state space model in
which the state evolution and observation equations are:
x(n) = 0.5 x(n-1) + 25 x(n-1) / (1+x(n-1)^2) + 8 cos(1.2(n-1))+ e(n) and
y(n) = x(n)^2 / 20 + f(n)
where e(n) and f(n) are mutually-independent normal random
variables of variances 10.0 and 1.0, respectively. A boostrap proposal
(i.e. sampling from the state equation) is used, together with multinomial
resampling after each iteration.

The `pfNonlinBS`

function returns two vectors, the first containing the posterior
filtering means; the second the posterior filtering standard deviations.

Adam M. Johansen, Dirk Eddelbuettel and Leah F. South

N. J. Gordon, S. J. Salmond, and A. F. M. Smith. Novel approach to nonlinear/non-Gaussian Bayesian state estimation. IEE Proceedings-F, 140(2):107-113, April 1993.

`simNonlin`

for a function to simulate from the model and
`nonLinPMMH`

for an example of particle
marginal Metropolis Hastings applied to a non-linear state space model.

1 2 | ```
sim <- simNonlin(len=50)
res <- pfNonlinBS(sim$data,particles=500,plot=TRUE)
``` |

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