abundance {PEkit}

Vector of frequencies of frequencies

Description

A function to calculate the abundance vector, or frequencies of frequencies of discrete or partly discrete data vector x. The abundance vector is used as input in the functions dPD(), MLEp(), and LMTp().

Usage

abundance(x)

Arguments

x

Data vector x.

Details

This function is equivalent to table(table(x)).

Value

This function returns a named vector with the frequencies of the frequencies in the data vector x. The function base::table(x) returns a contingency table with the frequencies in the input data vector x as values. The names(table(x)) are the unique values in data vector x. In abundance(x), the unique values in table(x) become the names of the values, while the values themselves are the frequencies of the frequencies of data vector x.

Examples

set.seed(111)
x<-rpois(10,10)
## The frequency table of x:
print(table(x))
## The frequency table of the frequency table of x:
abundance(x)