freq1way: Analysis of 1-dimensional frequency tables

Description

If hypothprob is absent: prints confidence intervals for the true proportions, a Chi-square test for uniformity, confidence intervals for differences in proportions (no corrections for multiple comparisons and plots the proportions.

Usage

freq1way(
  counts,
  hypothprob,
  conf.level = 0.95,
  addCIs = TRUE,
  digits = 4,
  arrowwid = 0.1,
  estimated = 0
)

Value

An invisible list containing the following components:

CIs: a matrix containing the confidence intervals.
exp: a vector of the expected counts.
chi: a vector of the components of Chi-square.

Arguments

counts: A 1-way frequency table as produced by table.
hypothprob: If present, a set of probabilities to test the cell counts against.
conf.level: confidence level for the confidence interval, expressed as a decimal.
addCIs: If true, adds confidence limits to plot of sample proportions.
digits: used to control rounding of printout.
arrowwid: controls width of arrowheads.
estimated: default is 0. Subtracted from the df for the Chi-square test.

Details

If hypothprob is present: prints confidence intervals for the true proportions, a Chi-square test for the hypothesized probabilities, and plots the sample proportions (with atached confidence limits) alongside the corresponding hypothesized probabilities. )

Examples

Run this code


##Body image data:
data(body.df)
eth.table = with(body.df, table(ethnicity))
freq1way(eth.table)
freq1way(eth.table,hypothprob=c(0.2,0.4,0.3,0.1))