May 30, 2019
The textbook Statistics: Unlocking the Power of Data (2/e 2017) by Lock, Lock, Lock, Lock, and Lock has publicly available datasets and interactive applets.
A list of the more than 100 datasets in the collection is available at this site. There is also an R package, Lock5Data, that contains documentation for the data.
Example: Restaurant tips
The data frame RestaurantTips contains, … well let’s look directly at the documentation.
library(Lock5Data)
help(RestaurantTips)## _R_e_s_t_a_u_r_a_n_t _T_i_p_s
##
## _D_e_s_c_r_i_p_t_i_o_n:
##
## Tip data from the First Crush Bistro
##
## _F_o_r_m_a_t:
##
## A dataset with 157 observations on the following 7 variables.
##
## 'Bill' Size of the bill (in dollars)
## 'Tip' Size of the tip (in dollars)
## 'Credit' Paid with a credit card? 'n' or 'y'
## 'Guests' Number of people in the group
## 'Day' Day of the week: 'm'=Monday, 't'=Tuesday, 'w'=Wednesday, 'th'=Thursday, or 'f'=Friday
## 'Server' Code for specfic waiter/waitress: 'A', 'B', or 'C'
## 'PctTip' Tip as a percentage of the bill
##
## _D_e_t_a_i_l_s:
##
## The owner of a bistro called First Crush in Potsdam, NY was
## interested in studying the tipping patterns of his customers. He
## collected restaurant bills over a two week period that he believes
## provide a good sample of his customers. The data recorded from 157
## bills include the amount of the bill, size of the tip, percentage
## tip, number of customers in the group, whether or not a credit
## card was used, day of the week, and a coded identity of the
## server.
##
## _S_o_u_r_c_e:
##
## Thanks to Tom DeRosa at First Crush for providing the tipping
## data.Some simple questions to ask:
- Does the tip depend on the size of the bill?
gf_point(Tip ~ Bill, data = RestaurantTips) %>%
gf_lm()
- Does the tip (as a percent of the bill) depend on whether the bill was paid with a credit card?
gf_jitter(Tip ~ Credit, data = RestaurantTips) %>%
gf_violin(fill = "blue", alpha = 0.3, color = NA) 
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