Publications by IvanTikhonov
DATA605Assignment11
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.) We may view the following information for the dataset Speed and Stopping Distances of Cars by looking at the help de...
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DATA607DW11
1.Recommender systems pinpoint user preferences and advise relevant content based on that information. One of my favorite recommender systems is Goodreads. Goodreads is one of the world’s largest sites for readers and book and movie recommendations. Target users include an audience who loves to read books and watch movies. It is also a plac...
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DATA605 DW_11
library(tidyverse) ## Warning: package 'tidyverse' was built under R version 4.2.2 ## ── Attaching packages ─────────────────────────────────────── tidyverse 1.3.2 ── ## ✔ ggplot2 3.3.6 ✔ purrr 0.3.5 ## ✔ tibble 3.1.8 ✔ dplyr 1.0.10 ##...
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DATA605Assignment_12
The attached who.csv dataset contains real-world data from 2008. The variables included follow. Country: name of the country LifeExp: average life expectancy for the country in years InfantSurvival: proportion of those surviving to one year or more Under5Survival: proportion of those surviving to five years or more TBFree: proportion of the p...
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Data 605 - Discussion Board12
Multiple Regression Real estate price prediction:Regression analysis, linear regression, multiple regression, and prediction models were all used to build this real estate dataset. It covers the purchase date, the age of the house, the location, the distance to the closest MRT station, and the housing price per square foot. Data set was acqui...
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TidyVerse CREATE assignment
Your task here is to Create an Example. Using one or more TidyVerse packages, and any dataset from fivethirtyeight.com or Kaggle, create a programming sample “vignette” that demonstrates how to use one or more of the capabilities of the selected TidyVerse package with your selected dataset. Getting started Lets load tidyverse package firs...
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Data605 Assignment13
Use integration by substitution to solve the integral below. ∫4e^(-7x) dx Using substitution u=−7x du/dx=d/dx(−7x)=−7 du=−7dx Hence ∫4e(−7x)dx=∫−1/7(−7)4e(−7x)dx =−1/7∫4e(−7x)(−7dx)=−1/7∫(4eu)du =−1/7∫4e(−7x)(−7dx)=−1/7∫(4eu)du =−4/7∫(eu)du=−(4/7)eu+C Replacing u with the value -7x =−(4/...
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Data605 DiscussionBoard13
Calculus Exercise 7.1.13 and 7.1.14 Find the total area enclosed by the functions f and g f(x)=2x2+5x−3,g(x)=x2+4x−1 # create functions f13 <- function(x) {2 * (x^2) + (5 * x) - 3} g13 <- function(x) {(x^2) + (4 * x) - 1} integrate(f13, lower = -3, upper = 2) ## -4.166667 with absolute error < 2.7e-13 integrate(g13, lower = -1, upper = 1...
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Data607_Project4
It can be useful to be able to classify new “test” documents using already classified “training” documents. A common example is using a corpus of labeled spam and ham (non-spam) e-mails to predict whether or not a new document is spam. For this project, you can start with a spam/ham dataset, then predict the class of new documents (e...
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TidyVerse EXTEND Assignment
TidyVerse EXTEND Assignment The purrr package and map() function purrr enhances R’s functional programming (FP) toolkit by providing a complete and consistent set of tools for working with functions and vectors. If you’ve never heard of FP before, the best place to start is the family of map() functions which allow you to replace many for...
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