Publications by Rajwant Mishra, Priya Shaji, Debabrata Kabiraj, Isabel Ramesar, Sin Ying Wong and Fan Xu
DATA 608 01 [46846] : Module 1 - Assignment 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/destination4debabrata/CUNY-Assignments/master/DATA%20608%2001%5B46846%5D/module1/Data/inc5000_data.csv"...
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DATA 605 02[46835] : HomeWork Assignment 1
ASSIGNMENT 1 IS 605 FUNDAMENTALS OF COMPUTATIONAL MATHEMATICS - FALL 2014 1. Problem set 1 You can think of vectors representing many dimensions of related information. For instance, Netflix might store all the ratings a user gives to movies in a vector. This is clearly a vector of very large dimensions (in the millions) and very sparse as the u...
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DATA 605 02[46835] : Week 1 Discussion
L-A First Course in Linear Algebra Chapter M: Matrices Section MM Page 190 C21 Compute the product AB of the two matrices below using both the definition of the matrix-vector product (Definition MVP) and the definition of matrix multiplication (Definition MM). \[\mathbf{A} = \left[\begin{array}{rrr}1 & 3 & 2 \\-1 & 2 & 1 \\0 & 1 & 0\end{array...
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DATA 605 02[46835] : HomeWork Assignment 2
ASSIGNMENT 2 IS 605 FUNDAMENTALS OF COMPUTATIONAL MATHEMATICS - 2015 1. Problem set 1 (1) Show that \[ A^TA \neq AA^T \] in general. (Proof and demonstration.) Solution For a n x m matrix A, \[ A^T \] is a m x n matrix. \[ A^TA \] is m x m matrix. \[ AA^T \] is a n x n matrix. If \[ n \neq m \], the size of \[ A^TA \] and \[ AA^T \] are differ...
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DATA 621 01[46893] : HomeWork1
Code Show All Hide All DATA 621 01[46893] : HomeWork1 1 Overview 2 Deliverables 3 DATA EXPLORATION 3.1 View rows and columns, variable types 3.2 Structure of data 3.3 Mean and Median of the data 3.4 Rename Columns 3.5 Visualize the data 3.6 Multivariate Plot 3.7 Missing or NA Values 3.8 Zero Values 3.9 Checking for outliers 3.10 Checking for ...
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DATA 605 02[46835] : HomeWork Assignment 6
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. Answer Solving by Random Sample selection red <- 54 white <- 9 blue <- ...
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DATA 605 02[46835] : Week 6 Discussion
P-Introduction to Probability Chapter 4. Conditional Probability 4.2 Continuous Conditional Probability Exercise 3 Page 172 The Acme Super light bulb is known to have a useful life described by the density function \[ f(t)=.01e^{-0.1t} \] Where t is measured in hours. (a) Find the failure rate of this bulb (see Exercise 2.2.6) Answer The ...
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DATA 621 01[46893] : HomeWork2
Code Show All Hide All DATA 621 Homework #2 Overview Deliverables Task 1: Download Data Set Task 2: Confusion Matrix Task 3: Accuracy Task 4: Classification Error Rate Task 5: Precision Task 6: Sensitivity Task 7: Specificity Task 8: F1Score Task 9: Prove 0 < F1Score < 1 Task 10: ROC Curve Task 11: Produce All Metrics Task 12: Package: Caret ...
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DATA 621 01[46893] : HW2v1
library(tidyverse) Overview In this homework assignment, you will work through various classification metrics. You will be asked to create functions in R to carry out the various calculations. You will also investigate some functions in packages that will let you obtain the equivalent results. Finally, you will create graphical output that also ...
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DATA 605 02[46835] : HomeWork Assignment 8
ASSIGNMENT 8 Chapter 7.2 Exercise #11 on page 303 of Probability Text A company buys 100 lightbulbs, each of which has an exponential lifetime of 1000 hours. What is the expected time for the first of these bulbs to burn out? (See Exercise 10.) Answer Let \(X_{1}, X_{2},...,X_{100}\) be 100 lightbulbs with exponential lifetime \(\mu=1000\). The ...
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