Confidence interval for ratio of variances (standard deviations) of 2 samples

Source: R/ci_F.R

Calculates the confidence interval for the ratio of the variance (standard deviation) of 2 samples (F distribution).

ci_F(s1, n1, s2, n2, conf.level = 0.95, digits = 2)

Arguments

s1

Sample's 1 standard deviation
n1

Sample size of sample 1
s2

Sample's 2 standard deviation
n2

Sample size of sample 2
conf.level

Confidence level to use for the confidence interval (Default is 0.95)
digits

Number of digits to round to (Default is 2)

Value

A tibble with the ratio of standard deviations and variances, degrees of freedom for both samples, and lower and upper ends of the confidence interval

Examples

s1 <- 3.1
n1 <- 15
s2 <- 0.8
n2 <- 12
ci_F(s1, n1, s2, n2)

#> # A tibble: 2 × 6
#>   stat  ratio   df1   df2 lower upper
#>   <chr> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 sd     3.88    14    11  2.11  6.82
#> 2 var   15.0     14    11  4.47 46.5