Datasets Used in This Book

1Datasets used in this book¶

MATH 1209 is a concept-first, calculator-first course: most worked examples build a small, clearly labeled hypothetical scenario right in the text — a shelter’s cat weights, a coffee cart’s morning rush, a campus fee referendum — with numbers chosen to teach the method cleanly, not pulled from an external file. Those in-text scenarios are not separate “datasets” you load; you read them straight off the page or the calculator screen.

One real, published dataset does get loaded into R and explored directly, in Week 1. This page documents it the same way the department documents every dataset in its teaching library, so you always know exactly where a number came from.

1.1KidsFeet¶

What it measures. Foot length and width for 39 children, gathered to ask a real question: do boys’ feet run wider than girls’, or does children’s shoe sizing just assume so? Week 1 uses it purely to practice classifying variables — you are not asked to answer the shoe-sizing question, though you are welcome to explore it.

Variables (as shown in Week 1’s head(KidsFeet) table):

1.2How to load it yourself¶

KidsFeet ships inside the mosaicData package, which loads automatically the moment you run library(mosaic) — there is no file to download and no path to get right.

library(mosaic)
data(KidsFeet)     # makes the table available by name
nrow(KidsFeet)      # 39
names(KidsFeet)     # the 8 column names above
head(KidsFeet)       # first 6 rows

Run this (or any other R in the book) for free at the CSUB JupyterHub, https://csub.jupyter.cal-icor.org/ — log in with your CSUB account and mosaic (with KidsFeet inside it) is already installed. If you have never opened a notebook before, start with R-Help Lesson 2 (getting into JupyterHub) and R-Help Lesson 6 (importing and loading data, including built-in tables like this one).