compress_freqdist {lazy.tools}

R Documentation

Compress Frequency Distribution by Aggregating Duplicate Entries

Description

Compress Frequency Distribution by Aggregating Duplicate Entries

Usage

compress_freqdist(x, freq, fill = 0, domain = NULL)

Arguments

x	Vector of values (domain of a scalar variable, numeric or string)
freq	Vector of frecuencies: (x, freq) is the frequency distribution.
fill	= 1 to fill the domain
domain	Domain of x to be filled. (coalescing)

Details

The purpose of this function is to remove the duplicate values of x and adjusting the associated frequency count in freq.

The core part of this function is:

 fnew <- xtabs( freq ~ x )
 xnew <- names(fnew)
 res <- data.frame(x=xnew, freq=fnew)

and if domain and fill are given, the result will be coalesced. (coalescing) Using the frequency table below

 x  freq
 1  1
 2  2
 2  1
 3  1

  compress_freqdist( x, freq, fill=1, domain=0:4)

returns

 x  freq
 0  0
 1  1
 2  3
 3  1
 4  0

Value

A data frame consisting of
x Vector of unique values
freq Vector of frequencies

Examples

x <- c(1,2,4,5,6, 2,4,6, 9 )
f <- c(1,2,2,1,2, 1,2,1, 1 )

( res <- compress_freqdist( x, f ) )
( res <- compress_freqdist( x, f, fill=1, domain=0:10 ) )


xc <- letters[c(1,2,4,5,6, 2,4,6, 9 )]
f <- c(1,2,2,1,2, 1,2,1, 1 )
( res <- compress_freqdist( xc, f ) )
( res <- compress_freqdist( xc, f, fill=1, domain=letters[0:10] ) )

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