mcmcapply | R Documentation |

Conveniently calculates statistics for mcmc.list objects.

```
mcmcapply(x, FUN, ...)
## S3 method for class 'mcmc.list'
stack(x, ...)
```

`x` |
Objects of class |

`FUN` |
A function to be used in the calculations, returning a single value. |

`...` |
Other arguments passed to |

`mcmcapply`

returns a certain statistics based on `FUN`

after coercing into a matrix. `FUN`

can be missing,
in this case `mcmcapply`

is equivalent
to calling `as.matrix`

on an 'mcmc.list' object.

`stack`

can be used to concatenates 'mcmc.list'
objects into a single vector
along with index variables indicating where each observation originated
from (e.g. iteration, variable, chain).

`mcmcapply`

returns statistic value for each variable
based on `FUN`

, using all values in all chains of the MCMC object.

`stack`

returns a data frame with columns:
iter, variable, chain, value.

Peter Solymos

```
data(regmod)
mcmcapply(regmod, mean)
mcmcapply(regmod, sd)
x <- stack(regmod)
head(x)
summary(x)
library(lattice)
xyplot(value ~ iter | variable, data=x,
type="l", scales = "free", groups=chain)
```

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