Publications by Jacob Martin
STAT 5230: Chapter 13 - Factor analysis - Bones Example
Calculating the mahalanobis distance to look for outliers data.frame( x = 1:nrow(bones), y = mahalanobis(bones, center = colMeans(bones), cov = var(bones)) ) |> ggplot( mapping = aes(x = x, y = y) ) + geom_col() + geom_hline( yintercept = qchisq((nrow(bones)-0.5)/nrow(bones), df = p), color = "red" ...
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STAT 5230: Chapter 9 Lab - Solutions
knitr::opts_chunk$set(echo = TRUE, fig.width=10, fig.height=6, fig.align = "center") # Load the needed package(s) below: pacman::p_load(readxl, tidyverse, skimr, caret, GGally, class, rpart, rpart.plot) # Change the default theme below: theme_set(theme_clas...
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DS 1870: Homework 5.2 Solutions - Spring 2024
Data description ESPN has a metric it uses to judge a quarterback’s (QB) performance called Quarterback Rating (QBR), and how it is calculated is kept a secret. The qbr data.csv file has the QBR rating and game statistics for all quarterback and game performances. The columns in the csv file are: qbr (response variable): The quarterback ratin...
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DS 1870: Homework 4.2 Solutions - Spring 2024
Question 1 Blackjack is a card game where the player goes up against the dealer (not other players). A round of blackjack can end in one of three ways: “player” wins, “dealer” wins, or a “push” (tie). The goal of blackjack is to try to get as close of a point total of 21 as possible without going over (called a bust). If the player i...
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STAT 5230: Homework 4 Solutions - 2024
knitr::opts_chunk$set(echo = TRUE, fig.align = "center", message = F, warning = F) ## Packages pacman::p_load(tidyverse, Rfast, MVN, heplots, skimr, GGally, car, rstatix) ################################################################################ theme_se...
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DS 2870: Homework 7 Solutions - Spring 2024
Data Description: ESPN has a metric it uses to judge quarterback (QB) performance called Quarterback Rating, QBR, and how it is calculated is kept a secret. The qbr game stats.csv file has the QBR rating and game statistics for all quarterback and game performances. The columns in the qbr_df data set are: response variable - qbr: The quarterback...
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DS 2870 - Homework 5 Solutions - Spring 2024
Question 1) Conditional Bar Chart Data Description: Housing Data The homes data set has 8 variables on 1299 homes that sold in January of 2023: type: The type of property zip: the zip code of the property price: the price the home sold for bed and baths: The number of beds and baths in the home, respectively sqft: The square footage of the home...
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STAT 5230: Classification Trees - Cats
Set up knitr::opts_chunk$set(echo = TRUE, fig.align = "center") pacman::p_load(rpart, rpart.plot, tidyverse, caret) theme_set(theme_bw()) # We will use the data cats, which is in the package, MASS cats <- MASS::cats |> rename(heart_wt = Hwt, body_wt = Bwt) head(cats) ## Sex body_wt heart_wt ## 1 ...
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STAT 5230: Classification Trees - Mushrooms
Chapter 5: Classification using Decision Trees knitr::opts_chunk$set(echo = TRUE, fig.align = "center") # Load them here: pacman::p_load(rpart, rpart.plot, tidyverse, caret) # Changing the default theme theme_set(theme_bw()) Decision Trees Example: To Eat or not to Eat? Can we determine if a mushroom is safe to eat b...
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DS 2870: Homework 6 Key - Spring 2024
Dice Description The dice rolling game Boreal comes with 7 dice: 4 six-sided dice (d6), 1 ten-sided die (d10), 1 twenty-sided die (d20), and 1 thirty-sided die (d30). All the dice start at 1 and increment by 1 to their max value (d6 = max 6, d30 = max 30). Question 1: Dice Rolling Function Create a function called dice_roller() that has the fo...
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