Publications by Ken Popkin
Data607 Project 1
Setup library(dplyr) library(stringr) Load tournament data data <- read.table("tournamentinfo.txt", sep = "\t", skip = 4) head(data,4) ## V1 ## 1 1 | GARY HUA |6.0 |W 39|W 21|W 18|W 14|W 7|D 12|D 4| ## 2 ON | 15445...
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Data606 Week 4 Homework
Problem 1 Area under the curve, Part I. (4.1, p. 142) What percent of a standard normal distribution \(N(\mu=0, \sigma=1)\) is found in each region? Be sure to draw a graph. cat('z < -1.35 is', pnorm(-1.35)) ## z < -1.35 is 0.08850799 DATA606::normalPlot(mean = 0, sd = 1, bounds = c(-1.35,4), tails = TRUE) cat('z > 1.48 is', pnorm(1.48)) ## z >...
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Data606 Week 4 Lab
In this lab we’ll investigate the probability distribution that is most central to statistics: the normal distribution. If we are confident that our data are nearly normal, that opens the door to many powerful statistical methods. Here we’ll use the graphical tools of R to assess the normality of our data and also learn how to generate random...
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Data607 Week3Assignment
library('dplyr') library(stringr) Problem 1 Using the 173 majors listed in fivethirtyeight.com’s College Majors dataset, provide code that identifies the majors that contain either “DATA” or “STATISTICS” majors <- read.csv('https://raw.githubusercontent.com/fivethirtyeight/data/master/college-majors/majors-list.csv') tail(majors,1) #...
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Class Presentation for Data 606
library(png) library(grid) img <- readPNG("C:/Users/user/Documents/00_Applications_DataScience/CUNY/DATA606/Presentation/Problem_217.png") grid.raster(img) Question 1: Would the mean or the median best represent what we might think of as a typical income for the 42 patrons at this coffee shop? What does this say about the robustness of the ...
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Data607 Week2 Assignment
knitr::opts_chunk$set(echo = TRUE) options(warn=-1) This notebook retrieves data from the movie surveys database and uses the information retrieved to answer the following questions: Surveys: 1. How many surveys have been completed? Participants in Surveys 2. How many participants were in each survey? 3. What is the min, max, and average age of ...
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Data606 Week 3 Lab
Hot Hands Basketball players who make several baskets in succession are described as having a hot hand. Fans and players have long believed in the hot hand phenomenon, which refutes the assumption that each shot is independent of the next. However, a 1985 paper by Gilovich, Vallone, and Tversky collected evidence that contradicted this belief and...
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Data607 Assignment 5
Assignment Summary The data for this assignment is loaded in a wide format, making it difficult to immediately perform exploratory work on the dataset. To address this the data will be reformatted from a wide to long format. Exploratory work to address the following questions will be completed with the reformatted data. Information about each ai...
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Data606 Week 7 Homework
Problem 1 Working backwards, Part II. (5.24, p. 203) A 90% confidence interval for a population mean is (65, 77). The population distribution is approximately normal and the population standard deviation is unknown. This confidence interval is based on a simple random sample of 25 observations. Calculate the sample mean, the margin of error, and...
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Data606 Lab 7
North Carolina births In 2004, the state of North Carolina released a large data set containing information on births recorded in this state. This data set is useful to researchers studying the relation between habits and practices of expectant mothers and the birth of their children. We will work with a random sample of observations from this da...
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