freq1way {s20x}R Documentation

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.

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. )

Usage

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

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.

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.

Examples

##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))

[Package s20x version 3.1-5 Index]