jefflittlejohn
Jeff Littlejohn
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Data 608 HW 1 - ggplot2
Assignment 1 of CUNY Data 608. Data visualization in R using ggplot2 package.
Data 624 Group 3 HW 1 HA2
First problems for HW1.
Data 622 HW1Q2
Junk data EDA
Data 622 HW1Q3
KNN in R.
Data 621 Group 2 HW 3
Regression analysis of high-crime neighborhoods in Boston
Data 621 Group 2 HW 3 Crime WIP 20191020
WIP group 2 assignment 3
Data 605 Spring 2019 HW7 - Jeff Littlejohn
Distribution party.
What Factors Influence MLS Attendance?
Examination of what factors (weather, day of the week, team performance, team novelty, etc.) influence MLS attendance.
Data 605 Spring 2019 HW6 - Jeff Littlejohn
Combinatorics and permutations.
Data 605 Spring 2019 HW5 - Jeff Littlejohn
Discrete and continuous probability.
Data 605 Spring 2019 HW4 - Jeff Littlejohn
Cofactors, inverses, SVDs, symmetric matrices, nullspaces, passion.
Data 605 Spring 2019 HW3 - Jeff Littlejohn
Eigen-stuff.
Data 605 Spring 2019 HW2 - Jeff Littlejohn
Transposes, LU decomposition, linear algebra adventure continues.
Data 605 Spring 2019 HW1 - Jeff Littlejohn
Linear algebra adventure begins.
Data 606 Fall 2018 Project - Jeff Littlejohn
California hospital statistics in the wake of the ACA. A particular focus on surgery volumes from 2013-2016.
Data 606 Fall 2018 HW8 - Jeff Littlejohn
Multiple regression stats homework.
Data 607 Fall 2018 Lab 8 - Jeff Littlejohn
Statistics lab focused on multiple linear regression.
Data 607 Fall 2018 - Final Project - Text Sentiment the Tidy Way - Amazon Reviews
Looking at how well sentiment analysis of Amazon review text predicts the accompanying star ratings, with a few digressions.
Data 607 Fall 2018 Week 12 Assignment - NoSQL Migration
Converting a RDBMS (MySQL) to NoSQL (Mongodb) using R.
Data 606 Fall 2018 HW7 - Jeff Littlejohn
Linear regression fun.
Data 606 Fall 2018 Presentation Problem 6.5
Categorical inference and polling.
Data 606 Fall 2018 Lab 7 - Jeff Littlejohn
Moneyball - linear regression lab.
Data 607 Fall 2018 Discussion Week 11 - Netflix Recommendation Engine
Looking at Netflix's recommendation engine(s) and how they evolved in the shift from being rating-driven to behavior-driven in the move to streaming video.
Data 607 Fall 2018 Project 4 - Jeff Littlejohn
Document classification using text processing.
Data 606 Fall 2018 HW6 - Jeff Littlejohn
Ch 6 HW - Inference for Categorical Data
Data 606 Fall 2018 Lab 6 - Jeff Littlejohn
Inference for Numerical Data lab work from Chapter 6.
Data 606 Fall 2018 Final Project Proposal - Jeff Littlejohn
Examination of how California hospital operations have changed in wake of Affordable Care Act (ACA) and other payment form. Focus on changes in surgical volumes from 2012 to 2016.
Data 607 Fall 2018 Week 5 Assignment - Working with APIs & the NY
Grabbing info about the most viewed articles from the last 30 days using the New York Times' JSON API.
Data 606 Fall 2018 HW5 - Jeff Littlejohn
Inference for numerical data.
Data 607 Fall 2018 Lab 7 - Jeff Littlejohn
Inference for Numerical Data. Z scores, F statistics, all the crazy stuff.
Data 606 Fall 2018 Lab 4b - Jeff Littlejohn
Foundations of Inference - Confidence Interval homework.
Data 606 Fall 2018 Lab 4a - Jeff Littlejohn
Foundations of Inference lab, part 1. Getting to know real estate in Ames, IA.
Data 606 Fall 2018 HW4 - Jeff Littlejohn
Foundations of Inference homework - Chapter 4
Data 607 Fall 2018 Project 3
Data Science Skills analysis by Alice Friedman, Jeff Littlejohn, Deepak Mongia, and Eleanor Romero.
Data 607 Project 3 - Data Science Skills (Partial)
Part of our Project 3 write-up analyzing data sets related to data science skills. This partial section looks the responses to our custom survey.
Data 607 Fall 2018 Week 7 Assignment - Parsing HTML, XML, and JSON into R
Creating HTML, XML, and JSON files from scratch and then bring them into dataframes in R.
Data 607 Fall 2018 Project 2 - Jeff Littlejohn
Tidyverse-focused project involving wrangling messy data sets and performing some quick analysis.
Data 606 Fall 2018 HW3 - Jeff Littlejohn
Normal distribution homework problems solved using R.
Data 606 Fall 2018 Lab 3 - Normal Distribution - Jeff Littlejohn
Examining the normal distribution through analysis of various body measurements.
Data 607 Fall 2018 Week 5 Assignment - Working with Tidy Data
Turning messy flight arrival status csv into tidy data.
Data 607 Fall 2018 Project 1 - Jeff Littlejohn
Wrangling chess tournament data from a messy quasi-pipe-delimited text file.
Data 606 Fall 2018 Lab 2 - Jeff Littlejohn
Hot hands - examining streak shooting and momentum in basketball using Kobe's 2009 NBA Finals shot record and simulation in R.
Data 606 Fall 2018 HW2 - Jeff Littlejohn
Probability.
Data 607 Fall 2018 Lab 3 - Jeff Littlejohn
Character manipulation and regular expressions with R.
Data 606 Fall 2018 Lab 1 - Jeff Littlejohn
Introduction to Data Chapter homework. Mostly exploratory work looking at CDC health data survey.
Data 606 Fall 2018 HW1 - Jeff Littlejohn
Intro to Data Chapt. 1 HW questions from OpenIntro Stats book.
Data 607 Fall 2018 Lab 2 - Jeff Littlejohn
Looking at movie survey responses using R and SQL. Using R to pass SQL to a local MySQL database to create objects and store data. Then bring the data back to R as a dataframe and performing some perfunctory analysis.
Data 607 Fall 2018 Lab 1 - Jeff Littlejohn
Subsetting and transforming the mushrooms data set.
Data 606 Fall 2018 Lab 0 - Jeff Littlejohn
Lab 0 of Data 606: Intro to R Studio
Data Science Math HW1 - Jeff Littlejohn
MSDS Summer Bridge 2018 Data Science Math HW1