N-V-Vm.tfl {zipfR}

Access Methods for Type Frequency Lists (zipfR)

Description

Return the sample size (N.tfl) and vocabulary size (V.tfl) of the type frequency list represented by a tfl object, as well as class sizes (Vm.tfl) of the corresponding frequency spectrum.

Note that these functions are not user-visible. They can be called implicitly through the generic methods N, V and Vm, applied to an object of type tfl.

Usage

  ## S3 method for class 'tfl'
N(obj, ...)

  ## S3 method for class 'tfl'
V(obj, ...)

  ## S3 method for class 'tfl'
Vm(obj, m, ...)

Arguments

obj

an object of class tfl, representing an observed type frequency list

m

non-negative integer value determining the frequency class m to be returned

...

additional arguments passed on from generic method will be ignored

Details

Only a single value is allowed for m, which may also be 0. In order to obtain multiple class sizes V_m, convert the type frequency list to a frequency spectrum with tfl2spc first.

For an incomplete type frequency list, Vm.tfl will return NA if m is outside the range of listed frequencies (i.e. for m < f.min or m > f.max).

Value

N.tfl returns the sample size N, V.tfl returns the vocabulary size V (or expected vocabulary size E[V]), and Vm.tfl returns the number of types that occur exactly m times in the sample, i.e. the class size V_m.

See Also

N, V, Vm for the generic methods and links to other implementations

tfl for details on type frequency list objects and links to other relevant functions