Confidence Interval for a Mean

Computes a confidence interval for a mean at a desired level of significance.

Usage

confidence_mean(object, ...)

# S4 method for numeric
confidence_mean(object, level = 0.95, type = c("student", "normal"))

Arguments

object

A numeric vector.

...

Currently not used.

level

A length-one numeric vector giving the confidence level. Must be a single number between \(0\) and \(1\).

type

A character string giving the type of confidence interval to be returned. It must be one "student" (the default) or "normal". Any unambiguous substring can be given.

Value

A length-two numeric vector giving the lower and upper confidence limits.

See also

Other summary statistics: confidence_binomial(), confidence_multinomial(), interval_credible(), interval_hdr()

Author

N. Frerebeau

Examples

## Confidence interval for a mean
x <- seq(from = -4, to = 4, by = 0.01)
y <- dnorm(x)

confidence_mean(y, type = "student")
#>     lower     upper 
#> 0.1151118 0.1345606 
confidence_mean(y, type = "normal")
#>     lower     upper 
#> 0.1151265 0.1345459 

## Confidence interval for a propotion
confidence_binomial(118, n = 236)
#>     lower     upper 
#> 0.4362086 0.5637914 

x <- c(35, 74, 22, 69)
confidence_multinomial(x)
#>           lower     upper
#> [1,] 0.12234021 0.2276598
#> [2,] 0.30308797 0.4369120
#> [3,] 0.06663649 0.1533635
#> [4,] 0.27911853 0.4108815