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Last data update: 2014.03.03

R: Create a Sample Membership Character Variable

create.samples

R Documentation

Create a Sample Membership Character Variable

Description

Provides a character vector with possible values of "Estimation", "Validation" and "Holdout" that can then be used to assign observations of a data frame to estimation, validation, or (optionally) holdsout samples using the subset option of a variety of functions.

Usage

create.samples(x, est=0.34, val=0.33, rand.seed=1)

Arguments

`x`	A data frame.
`est`	The percentage of the total sample to allocate to the estimation sample. The value of `est` should range from zero to one
`val`	The percentage of the total sample to allocate to the validation sample. The value of `val` should range from zero to one
`rand.seed`	A parameter passed to `set.seed` for to specify the seed of the random number generator.

Details

The values of est and val should sum to a value between zero and one. If greater than one, an error is returned. If less than one, the remaining percentage of the sample is allocated to the holdout sample.

Value

A character vector with possible values of "Estimation", "Validation" and (optionally) "Holdout". The length of the vector equals the number of rows in the original data frame.

Author(s)

Dan Putler

Examples

  data(CCS)
  # Create a new set of samples with 40 percent in each of the estimation and
  # validation samples, and 20 percent in the holdout sample.
  CCS$Sample <- create.samples(CCS, est=0.4, val=0.4)

Results


R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> library(BCA)
Error in library(BCA) : there is no package called 'BCA'
Execution halted