ifr_os_var_test: One Sample Variance Comparison Test

In inferr: Inferential Statistics

One Sample Variance Comparison Test

Description

ifr_os_var_test performs tests on the equality of standard deviations (variances).It tests that the standard deviation of a sample is equal to a hypothesized value.

Usage

ifr_os_var_test(
  data,
  x,
  sd,
  confint = 0.95,
  alternative = c("both", "less", "greater", "all"),
  ...
)

Arguments

data	a data.frame or tibble
x	numeric; column in data
sd	hypothesised standard deviation
confint	confidence level
alternative	a character string specifying the alternative hypothesis, must be one of "both" (default), "greater", "less" or "all". You can specify just the initial letter
...	additional arguments passed to or from other methods

Value

ifr_os_var_test returns an object of class "ifr_os_var_test". An object of class "ifr_os_var_test" is a list containing the following components:

n	number of observations
sd	hypothesised standard deviation of x
sigma	observed standard deviation
se	estimated standard error
chi	chi-square statistic
df	degrees of freedom
p_lower	lower one-sided p-value
p_upper	upper one-sided p-value
p_two	two-sided p-value
xbar	mean of x
c_lwr	lower confidence limit of standard deviation
c_upr	upper confidence limit of standard deviation
var_name	name of x
conf	confidence level
type	alternative hypothesis

Deprecated Function

infer_os_var_test() has been deprecated. Instead use ifr_os_var_test().

References

Sheskin, D. J. 2007. Handbook of Parametric and Nonparametric Statistical Procedures, 4th edition. : Chapman & Hall/CRC.

See Also

var.test

Examples

# lower tail
ifr_os_var_test(mtcars, mpg, 5, alternative = 'less')

# upper tail
ifr_os_var_test(mtcars, mpg, 5, alternative = 'greater')

# both tails
ifr_os_var_test(mtcars, mpg, 5, alternative = 'both')

# all tails
ifr_os_var_test(mtcars, mpg, 5, alternative = 'all')

inferr documentation built on April 4, 2025, 2:08 a.m.