slipper_: Bootstrap a function that returns a single number

In jtleek/slipper: Easy and tidy bootstrapping

Description

Takes a data frame, a function that returns a single number, and a number of replicates and returns a data frame with the function calculated on the observed sample and on B bootstrap samples.

Usage

slipper_(df, expr, B = 100)

Arguments

df	A data frame
expr	A an expression with a function that operates on one or more variables from the data frame.
B	the number of bootstrap samples to draw

Value

out A data frame with the values, whether they come from the observed data or the bootstrapped data.

Examples

# Boostrap the mean of the mpg variable in the mtcars data set
slipper(mtcars,mean(mpg),B=100)

# Bootstrap the mean of the mpg variable with piping
mtcars %>% slipper(mean(mpg),B=100)

# Calculate a confidence interval using the quantiles method
mtcars %>% slipper(mean(mpg),B=100) %>%
 filter(type=="bootstrap") %>%
 summarize(ci_low = quantile(value,0.025),
           ci_high = quantile(value,0.975))

jtleek/slipper documentation built on May 20, 2019, 3:14 a.m.