Description Usage Arguments Details Value See Also Examples

Compute incremental random samples from a frequency spectrum (an object
of class `spc`

).

1 | ```
sample.spc(obj, N, force.list=FALSE)
``` |

`obj` |
an object of class |

`N` |
a vector of non-negative integers in increasing order, the sample sizes for which incremental samples will be generated |

`force.list` |
if |

This function is currently implemented as a wrapper around
`sample.tfl`

, using `spc2tfl`

and `tfl2spc`

to convert
between frequency spectra and type frequency lists. A direct
implementation might be slightly more efficient, but would very likely
not make a substantial difference.

If `N`

is a single integer (and the `force.list`

flag is not
set), a `spc`

object representing the frequency spectrum of a
random sample of size *N* from `obj`

.

If `N`

is a vector of length greater one, or if
`force.list=TRUE`

, a list of `spc`

objects representing the
frequency spectra of incremental random samples of the specified sizes
*N*. *Incremental* means that each sample is a superset of
the preceding sample.

`spc`

for more information about frequency spectra

`sample.tfl`

is an analogous function for type frequency
lists (objects of class `tfl`

)

`sample.spc`

takes a single *concrete* random
subsample from a spectrum and returns the spectrum of the subsample,
unlike `spc.interp`

, that computes the *expected*
frequency spectrum for random subsamples of size `N`

by
binomial interpolation.

1 2 3 4 5 6 7 8 9 10 11 | ```
## read Brown spectrum
data(Brown.spc)
summary(Brown.spc)
## sample a spectrum of 100k tokens
MiniBrown.spc <- sample.spc(Brown.spc,1e+5)
summary(MiniBrown.spc)
## if we repat, we get a different sample
MiniBrown.spc <- sample.spc(Brown.spc,1e+5)
summary(MiniBrown.spc)
``` |

zipfR documentation built on Aug. 17, 2017, 5:05 p.m.

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