Publications by Renida Kasa
DATA607 - Week11
Week 11 Assignment Your task is to analyze an existing recommender system that you find interesting. You should: 1. Perform a Scenario Design analysis as described below. Consider whether it makes sense for your selected recommender system to perform scenario design twice, once for the organization (e.g. Amazon.com) and once for the organization�...
6422 sym
DATA605 - HW11
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(ggplot2) data(cars) str(cars) ## 'data.frame': 50 obs. of 2 variables: ## $ speed: num 4 4 7 7 8 9 10 10 10...
1198 sym R (1663 sym/10 pcs) 2 img
DATA606 - Lab 8
The Human Freedom Index is a report that attempts to summarize the idea of “freedom” through a bunch of different variables for many countries around the globe. It serves as a rough objective measure for the relationships between the different types of freedom - whether it’s political, religious, economical or personal freedom - and other soc...
11347 sym R (5189 sym/25 pcs) 7 img
DATA607 - HW9
library("jsonlite") library(dplyr) ## ## Attaching package: 'dplyr' ## The following objects are masked from 'package:stats': ## ## filter, lag ## The following objects are masked from 'package:base': ## ## intersect, setdiff, setequal, union The New York Times web site provides a rich set of APIs, as described here: https://developer.ny...
371 sym R (33285 sym/8 pcs)
DATA 605 - HW10
Homework 10 Smith is in jail and has 1 dollar; he can get out on bail if he has 8 dollars. A guard agrees to make a series of bets with him. If Smith bets A dollars, he wins A dollars with probability .4 and loses A dollars with probability .6. Find the probability that he wins 8 dollars before losing all of his money if: he bets 1 dollar each tim...
2082 sym
DATA607 - Project 3
library(dplyr) ## ## Attaching package: 'dplyr' ## The following objects are masked from 'package:stats': ## ## filter, lag ## The following objects are masked from 'package:base': ## ## intersect, setdiff, setequal, union library(ggplot2) library(tidyr) Project 3 This is a project for CUNY SPS 607 - Data Acquisition and Management. It ...
7595 sym R (21894 sym/32 pcs) 7 img
DATA605 - HW9
#HOMEWORK 9 1. #11 page 363 This exercise asks the following: The price of one share of stock in the Pilsdorff Beer Company (see Exercise 8.2.12) is given by Yn on the nth day of the year. Finn observes that the differences Xn = Yn+1 - Yn appear to be independent random variables with a common distribution having mean = 0 and variance = 1/4. If Y1...
2779 sym
DATA605_HW8
#11 and #14 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? \[ λ=1/1000 \] \[ n=100 \] \[ 1/(n * λ)=1/(100 * 1/1000)= 1/(1/10) = 10 hours \] 14.Assume that X1 and X2 are independent random variables, each h...
1431 sym
DATA607 - Assignment 7
Assignment – Working with XML and JSON in R Pick 3 of your favorite books on one of your favorite subjects. At least one of the books should have more than one author. For each book, include the title, authors, and two or three other attributes that you find interesting. Take the information that you’ve selected about these three books, and sep...
1382 sym R (6350 sym/17 pcs)
Inference for numerical data - DATA606 - LAB7
Getting Started Load packages In this lab, we will explore and visualize the data using the tidyverse suite of packages, and perform statistical inference using infer. The data can be found in the companion package for OpenIntro resources, openintro. Let’s load the packages. library(tidyverse) library(openintro) library(infer) The data Every tw...
9058 sym R (8353 sym/74 pcs) 5 img