Publications by Abdelmalek Hajjam
Data 612 - Project 3
Introduction The goal of this assignment is to implement a matrix factorization method—such as singular value decomposition (SVD) or Alternating Least Squares (ALS)—in the context of a recommender system. Matrix Factorization or matrix decomposition is factorization of that matrix into three matrices. The product of these matrices will produc...
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Data612 - Project4
Goal & Problem Statement The goal of this assignment is to compare the accuracy of recommender system algorithms. I will build functions to evaluate the best model and compare their accuracies. The data for the project is taken from the Jester Joke Recommender System and downloaded from http://www.ieor.berkeley.edu/~goldberg/jester-data/. The dat...
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Data612-Discussion2
For this discussion item, please watch the following talk and summarize what you found to be the most important or interesting points. The first half will cover some of the mathematical techniques covered in this unit’s reading and the second half some of the data management challenges in an industrial-scale recommendation system. Overview Chr...
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Data612 - Final Project
Introduction Goodreads is a social cataloging website that allows individuals to search freely its database of books, annotations, quotes, and reviews. Users can sign up and register books to generate library catalogs and reading lists. They can also create their own groups of book suggestions, surveys, polls, blogs, and discussions. Goodreads’...
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Data 698 - Project Proposal
Hospital Diebetic Cases Readmission Team Members Monu Chacko Md Forhad Akbar Abdelmalek Hajjam Shovan Biswas Overview and Motivation Hospitalizations account for almost one-third of the total health care spending in the United States. A substantial portion of those hospitalizations are readmissions, which is why the Hospital Readmissions Redu...
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Data624 - Homework2
Homework 2 library(knitr) library(kableExtra) library(ggplot2) library(fpp2) library(readxl) Exercise 3.1 For the following series, find an appropriate Box-Cox transformation in order to stabilise the variance. usnetelec usgdp mcopper enplanements usnetelec head(usnetelec) ## Time Series: ## Start = 1949 ## End = 1954 ## Frequency = 1...
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Data624 Homework1
library(knitr) library(kableExtra) #install.packages("fpp2") library(fpp2) Exercise 2.1 Use the help function to explore what the series gold, woolyrnq and gas represent. # help(gold) # help(woolyrnq) # help(gas) head(gold) ## Time Series: ## Start = 1 ## End = 6 ## Frequency = 1 ## [1] 306.25 299.50 303.45 296.75 304.40 298.35 tsdis...
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Data624 - Homework3
Homwork 3 library(knitr) library(kableExtra) library(ggplot2) library(fpp2) library(seasonal) library(readxl) Exercise 6.2 The plastics data set consists of the monthly sales (in thousands) of product A for a plastics manufacturer for five years. Plot the time series of sales of product A. Can you identify seasonal fluctuations and/or a tr...
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data624 - Project 1
This project consists of 3 parts - two required and one bonus and is worth 15% of your grade. The project is due at 11:59 PM on Sunday March 31. I will accept late submissions with a penalty until the meetup after that when we review some projects. library(tidyverse) library(scales) library(lubridate) library(knitr) library(fpp2) library(rea...
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Data624-HW5
library(kableExtra) library(corrplot) library(fpp2) library(plotly) library(gridExtra) library(readxl) Exercise 7.1 Consider the pigs series — the number of pigs slaughtered in Victoria each month. Monthly total number of pigs slaughtered in Victoria, Australia (Jan 1980 – Aug 1995). #using library(fpp2) #help("pigs") head(pigs) ## ...
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