Description Usage Format Examples

A sampling bowl used as the population in a simulated sampling exercise. Also known as the urn sampling framework https://en.wikipedia.org/wiki/Urn_problem.

1 |

A data frame 2400 rows representing different balls in the bowl, of which 900 are red and 1500 are white.

- ball_ID
ID variable used to denote all balls. Note this value is not marked on the balls themselves

- color
color of ball: red or white

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | ```
library(dplyr)
library(ggplot2)
# Take 10 different samples of size n = 50 balls from bowl
bowl_samples_simulated <- bowl %>%
rep_sample_n(50, reps = 10)
# Compute 10 different p_hats (prop red) based on 10 different samples of
# size n = 50
p_hats <- bowl_samples_simulated %>%
group_by(replicate, color) %>%
summarize(count = n()) %>%
mutate(proportion = count/50) %>%
filter(color == "red")
# Plot sampling distribution
ggplot(p_hats, aes(x = proportion)) +
geom_histogram(binwidth = 0.05) +
labs(x = expression(hat(p)), y = "Number of samples",
title = "Sampling distribution of p_hat based 10 samples of size n = 50")
``` |

moderndive/moderndive documentation built on July 28, 2018, 4:13 a.m.

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