Publications by Donald Butler
DATA 624 - Homework 6
Homework 6 library(fpp3) library(tidyverse) library(latex2exp) Exercise 9.1 Figure 9.32 shows the ACFs for 36 random numbers, 360 random numbers and 1000 random numbers. Figure 9.32 Explain the differences among these figures. Do they all indicate that the data are white noise? The main differences between these figures is the 95% confidence in...
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DATA 624 - Homework 5
Homework 5 library(fpp3) library(tidyverse) Exercise 8.1 Consider the number of pigs slaughtered in Victoria, available in the aus_livestock dataset. Use the ETS() function to estimate the equivalent model for simple exponential smoothing. Find the optimal values of \(\alpha\) and \(\ell_0\), and generate forecasts for the next four months. vict...
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DATA 624 - Homework 4
Homework 4 library(fpp3) library(tidyverse) library(corrplot) library(mlbench) library(inspectdf) # factor plots library(naniar) # missing values by factor Exercise 3.1 The UC Irvine Machine Learning Repository contains a data set related to glass identification. The data consist of 214 glass samples labeled as one of seven class categori...
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DATA 624 - Homework 3
Homework 3 library(fpp3) library(tidyverse) Exercise 5.1 Produce forecasts for the following series using whichever of NAIVE(y), SNAIVE(y) or RW(y ~ drift()) is more appropriate in each case: Australian Population (global_economy) Use of the RW(y ~ drift()) is most appropriate because the data is trending strictly increasing and has no seasonali...
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DATA 624 - Homework 1
Homework 1 library(fpp3) library(tidyverse) library(ggplot2) Exercise 2.1 Explore the following four time series: Bricks from aus_production, Lynx from pelt, Close from gafa_stock, Demand from vic_elec. Use ? (or help()) to find out about the data in each series. What is the time interval of each series? Use autoplot() to produce a time plot of ...
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DATA 608 - Final Project
library(tidyverse) PowerBI Visualization Project I work for Carrols Corporation which is the largest Burger King franchisee in the US. In my role, I am responsible for managing the Windows computer systems and the other networked devices in each of our 1000 restaurants. I wanted to work with a dataset from my work and developed a data visualiz...
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DATA 604 - Assignment Week 7
Based on the model created on Week 3 Assignment, add the schedules, wights and processes that are closely related to your model. If it is a real scenario, or the most probably values, if it is a generic process. Original Model The original model was a representation of a concession stand in a movie theater. In the original version of the model,...
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DATA 604 - Assignment Week 9
Markov Chain Simulation Based on this week’s model, and the Markov simulation website, https://www.zweigmedia.com/RealWorld/markov/markov.html, create a model in Simio to represent 4 possible states of a process. Impersonate the objects used in the model to resemble the process illustrated with the help of the symbols. Bring a small narrative ...
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DATA 604 - Assignment Week 3
Identify a routinary activity that requires a queue to be managed, and document it. Highlight the attributes of the entities involved and the estimated times allotted for the execution of each step. I began by modeling a concession stand at the movie theater. The concession stand will be staffed with 5 workers, and each register has its own que...
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DATA608 - Module 1
Principles of Data Visualization and Introduction to ggplot2 I have provided you with data about the 5,000 fastest growing companies in the US, as compiled by Inc. magazine. lets read this in: inc <- read.csv("https://raw.githubusercontent.com/charleyferrari/CUNY_DATA_608/master/module1/Data/inc5000_data.csv", header= TRUE) And lets preview thi...
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