Publications by Joshua Registe
Data 605 Assignment 3
Problem Set 1 What is the rank of the Matrix A? (A<-matrix(c(1,-1,0,5, 2,0,1,4, 3,1,-2,-2, 4,3,1,-2), nrow =4)) ## [,1] [,2] [,3] [,4] ## [1,] 1 2 3 4 ## [2,] -1 0 1 3 ## [3,] 0 1 -2 1 ## [4,] 5 4 -2 -2 qr(A)$rank ## [1] 4 Given an mxn matrix where m>n,...
836 sym R (729 sym/10 pcs)
Data 621 Homework 1 (Group 3)
Source code: https://github.com/djlofland/DS621_F2020_Group3/tree/master/Homework_1 Overview In professional sports, there is a huge interest in attempting to leverage historic statistics to both predict future outcomes (wins/losses) and explore opportunities for tuning or improving a team or individual’s performance. This data-driven approach...
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Data605 assignment 6
Question 1 A box contains 54 red marbles, 9 white marbles, and 75 blue marbles. If a marble is randomly selected from the box, what is the probability that it is red or blue? Express your answer as a fraction or a decimal number rounded to four decimal places The probability can be expressed as probability of red, plus the probability of blue m...
5211 sym R (1464 sym/28 pcs)
Data 605 Assignment 9
Question 1 The price of one share of stock in the Pilsdorff Beer Company (see Exercise 8.2.12) is given by \(Y_n\) on the \(n\)th day of the year. Finn observes that the differences \(X_n = Y_{n+1} - Y_n\) appear to be independent random variables with a common distribution having mean \(\mu = 0\) and variance \(\sigma^2 = \frac{1}{4}\). If \(Y_1...
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Data 605 Final Project
Load all the necessary Libraries library(gridExtra) library(RColorBrewer) library(Matrix) library(scales) library(corrplot) library(MASS) library(psych) library(ggplot2) library(DataExplorer) library(ggpmisc) The following rmarkdown is for the final exam for Data 605 Problem 1 Using R, generate a random variable X that has 10,000 random...
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Data 621 Homework 5 (Group 3)
Source code: https://github.com/djlofland/DS621_F2020_Group3/tree/master/Homework_5 Overview The wine dataset is a highly popular one in the data science community, as it models some of the challenges of real world datasets and can be modeled by a variety of different model types. We will first explore the data looking for issues or challenges (...
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Data 605 Assignment 14
Task This week, we’ll work out some Taylor Series expansions of popular functions. \[ f(x) = \frac{1}{(1-x)} \] \[ f(x) = e^x \] \[ f(x) = \ln(1 + x) \] For each function, only consider its valid ranges as indicated in the notes when you are computing the Taylor Series expansion. Please submit your assignment as a R-Markdown document. 1....
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Data 621 Homework 4 (Group 3)
Source code: https://github.com/djlofland/DS621_F2020_Group3/tree/master/Homework_4 0. Introduction Group 3 created a multiple linear regression and binary logistic model to estimate the probability of a driver having an auto accident, and the monetary damanage, for the customer Khansari Auto Insurance. As autoinsurance and insurance in general,...
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Data 605 Assignment 12
Assignment Provide a scatterplot of LifeExp~TotExp, and run simple linear regression. Do not transform the variables. Provide and interpret the F statistics, R^2, standard error,and p-values only. Discuss whether the assumptions of simple linear regression met. Raise life expectancy to the 4.6 power (i.e., LifeExp^4.6). Raise total expenditures...
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Data 605 Assignment 11
Using the cars dataset in R, build a linear model for stopping distance as a function of speed and replicate the analysis of your textbook chapter 3 (visualization, quality evaluation of the model, and residual analysis.) library(tidyverse) library(gridExtra) library(dplyr) library(ggpmisc) library(tidymodels) library(DataExplorer) data <- c...
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