Publications by Julia Ferris
Discussion Week 2
Suppose that A is a square matrix of size n and \(\alpha \in C\) is a scalar. Prove that det ( \(\alpha A\) ) = \(\alpha^n\) det (A). Let A = \(\begin{bmatrix} a & b \\ c & d \end{bmatrix}\) , n = 2 since the matrix has 2 rows det ( \(\alpha\) \(\begin{bmatrix} a & b \\ c & d \end{bmatrix}\) ) = \(\alpha^2\) det ( \(\begin{bmatrix} a & b \\ c &...
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Homework 1 - DATA 605
Example: Building the letter H The x-values are composed of repetitions of values 0 through 1 that correspond to the lines that make up an H along the x-axis. The y-values are composed of repetitions of values -1 through 1 that make up an H along the y-axis. The plot creates an H. x <- c(rep(0,500),seq(0,1,length.out=1000), rep(1,500)) y <- c(s...
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Final Homework 1 605
Example: Building the letter H The x-values are composed of repetitions of values 0 through 1 that correspond to the lines that make up an H along the x-axis. The y-values are composed of repetitions of values -1 through 1 that make up an H along the y-axis. The plot creates an H. x <- c(rep(0,500),seq(0,1,length.out=1000), rep(1,500)) y <- c(s...
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Final Project - DATA 607
Table of contents Introduction As a Product Genesis: Class Project to Product Phase 1: POC (Completed) Phase 2: Alpha - The Working Product Future Development Raw Product Demonstration Demonstration for Insurance Professionals Schedule of Values: Mapped Overview: CUNY Property Values Property Value by Flood Zone Risk Scoring Summary of Values b...
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Maps Draft
source("nycfun.r") ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.2 ✔ readr 2.1.4 ## ✔ forcats 1.0.0 ✔ stringr 1.5.0 ## ✔ ggplot2 3.4.3 ✔ tibble 3.2.1 ## ✔ lubridate 1.9.2 ✔ tidyr 1.3.0...
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Final Project - DATA 606
Human Trafficking Data Analysis - DATA 606 Julia Ferris 12/6/2023 Disclaimer This presentation contains content about human trafficking. If at any time it becomes too much, feel free to mute your computer and turn the volume on at the end. Abstract Human trafficking is a crime that makes victims of people of all ages, genders, and nationali...
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Project 4
Introduction In this assignment, spam emails and non-spam (ham) emails are used to create a model that will determine if other emails are spam or not. To do this, hundreds of emails already characterized as spam or ham were labelled. A portion of the data frame was used as a training set, and the other portion was used as a testing set. The tra...
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Lab 9 - Multiple Linear Regression
library(tidyverse) library(openintro) library(GGally) Exercise 1 Is this an observational study or an experiment? The original research question posed in the paper is whether beauty leads directly to the differences in course evaluations. Given the study design, is it possible to answer this question as it is phrased? If not, rephrase the q...
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Assignment 10 - Sentiment Analysis
Section 1: This section shows the walkthrough of the example seen in Chapter 2 of “Text Mining with R.” In this chunk of code, the data frames are shown for a few of the sentiment lexicons. library(tidytext) ## Warning: package 'tidytext' was built under R version 4.3.2 get_sentiments("afinn") ## # A tibble: 2,477 × 2 ## word valu...
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Tidyverse Assignment
Introduction In this demonstration, we will be using the packages tidyverse and ggplot2. ggplot2 is one of the packages that automatically loads with the tidyverse. This package is used for data visualization. We will focus on visualizing data with two variables. Some options include geom_violin(), geom_density_2d(), and geom_rug(). These are l...
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