Publications by James Naval
DATA607_Week11_Assignment9
Your task is to analyze an existing recommender system that you find interesting. You should: 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’s customers. Att...
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JNaval_DATA605_Discussion_Post_Week11
Introduction For this discussion post I decided to analyzed data from World Bank’s Data Bank. My downloaded data was upload to my github account Gitbub repository. GDP <- read.csv('https://raw.githubusercontent.com/jnaval88/DATA605/main/Week11/Discussion11-GDP_Birth_Rate.csv') GDP$X2019..YR2019. = as.numeric(GDP$X2019..YR2019) ## Warning: NA...
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DATA607_Week10_HW10
The primary example code from chapter 2 working in R with and Install libraries Introduction For this assignment we were asked to use In Text Mining with R, Chapter 2 looks at Sentiment Analysis. Use the primary example code from chapter 2 working in an R Markdown document. Also provide a citation to this base code. lasly we were asked to exte...
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JNaval_HW10_DATA605
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 time (timid ...
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JNaval_DATA605_Discussion_Post_Week10
Chapter 11 Exercise 2 Page 414 In Example 11.4, let \(a = 0\) and \(b = 1/2\). Find \(P\), \(P_2\), and \(P_3\). What would \(P_n\) be? What happens to \(P_n\) as n tends to infinity? Interpret this result. Ans. let a = 0 and b = 1/2 P P <- matrix(c(1,0,1/2,1/2), nrow = 2, byrow = TRUE) P ## [,1] [,2] ## [1,] 1.0 0.0 ## [2,] 0.5 0....
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JNaval_DATA605_HW9
Question 1 Exercise 11 page 363 The price of one share of stock in the Pilsdorff Beer Company (see Exercise 8.2.12) is given by \(Y_n\) on the nth 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...
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DATA607_Week9_HW8
Introduction In this assignment we have been asked to use the New York Times Developer API to obtain information and pull it into a R data frame. Using the MOST Popular API For the first example I will use the MOST POPULAR API, to load the most shared articles by facebook. url <- paste("https://api.nytimes.com/svc/mostpopular/v2/shared/1/faceboo...
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Data605_Discussion_Week_9
Chapter 9 Page 354 Exercise 1. A die is rolled 24 times. Use the Central Limit Theorem to estimate the probability that the sum is greater than 84. the sum is equal to 84. Ans. (a) the sum is greater than 84. ## EV = Expected value ## VX = Variance ## SD = Standard Deviation EVX <- (1 * (1/6) + 2 * (1/6) + 3 * (1/6) + 4 * (1/6) + 5 * (1/6) ...
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JNaval_HW8_DATA605
Exercise 11 pg. 303 A company buys 100 light bulbs, each of which has an exponential lifetime of 1000 hours. What is the expected time for the first of these bulbs to burnout? (See Exercise 10.) Note that \(X_i \sim exp(\lambda_i )\), for \(i = 1,2,3 ...n\), and \(X_1 , X_2 ... X_n\) are mutually independent random variables, then \[min \{ ...
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JNaval_DATA605_Discussion_Post_Week8
7 (a) A die is rolled three times with outcomes X1, X2, and X3. Let Y3 be the maximum of the values obtained. Show that \[P (Y3 ≤ j) = p(X1 ≤ j)3. \] Use this to find the distribution of Y3. Does Y3 have a bell-shaped distribution? Now let Yn be the maximum value when n dice are rolled. Find the distribution of Yn. Is this distribution bel...
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