samplesSetting {BRugs} | R Documentation

## Change settings used for calculations

### Description

These low level functions can be used to set begin, end, and thinning of chains as well as the first/last chain of the stored sample.

### Usage

    samplesSetBeg(begIt)
    samplesSetEnd(endIt)
    samplesSetThin(thin)
    samplesSetFirstChain(first)
    samplesSetLastChain(last)

### Arguments

`begIt` | First iteration of the stored sample used for calculating statistics.
`endIt` | Last iteration of the stored sample used for calculating statistics.
`thin` | Every `thin`-th iteration of each chain is used to contribute to the statistics being calculated.
`first, last` | First/last chain of the stored sample used for calculating statistics.

### Details

`samplesSetBeg` sets the first iteration of the stored sample used for calculating statistics to `begIt`.

`samplesSetEnd` sets the last iteration of the stored sample used for calculating statistics to `endIt`.

`samplesSetThin` sets the numerical field used to select every `thin`-th iteration of each chain to contribute to the statistics being calculated.

`samplesSetFirstChain` is used to set the first chain of the stored sample used for calculating statistics to be `first`.

`samplesSetLastChain` is used to set the last chain of the stored sample used for calculating statistics to be `last`.

### Note

Note the difference between this and the thinning facility of the update function: when thinning via the update function we are permanently discarding samples as the MCMC simulation runs, whereas here we have already generated (and stored) a suitable number of (posterior) samples and may wish to discard some of them only temporarily. Thus, setting `thin > 1` here will not have any impact on the storage (memory) requirements; if you wish to reduce the number of samples actually stored (to free-up memory) you should thin via the update function.

### See Also

`BRugs`, `help.WinBUGS`

[Package BRugs version 0.3-2 Index]