conf_int: conf_int

In danjdrennan/surveyr: Summary Statistics and Visualizations for Surveys

Description

A helper function for generating symmetric confidence intervals using a t or standard normal distribution. The confidence interval is a 100(1 - alpha)% confidence interval.

Usage

conf_int(.tbl, .alpha, .interval = "t")

Arguments

.tbl	Output from mk_stat or stratified_estimator
.alpha	The confidence level.
.interval	Either "t" or "z". If "t", degrees of freedom are inferred from the input .tbl

Value

A list with

level	The percentage of the confidence interval, 100(1-alpha)
df	NA if .interval="z", otherwise the degrees of freedom used in t interval
lower	The lower bound of the confidence interval
upper	The upper bound of the confidence interval

Examples

# Simplified output similar to stratified_sample
ds <- tibble::tibble(Ntotal=10, ntotal=4, point=3, se=1)
conf_int(ds, 0.05, "t")

# Simplified output from mk_stat
d <- tibble::tibble(n = 4, point=3, se=1)
conf_int(d, 0.05, "t")

danjdrennan/surveyr documentation built on Dec. 19, 2021, 8:08 p.m.