Lecture4 - lecture 4 Descriptive Statistics for Categorical...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Bar Charts and Pie Charts Mode and Median lecture 4, Descriptive Statistics for Categorical Data Outline 1 Frequency and Relative Frequency Tables 2 Bar Charts and Pie Charts 3 Mode and Median
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Bar Charts and Pie Charts Mode and Median lecture 4, Descriptive Statistics for Categorical Data Example 1. Amazon Hosts Every day, more than 100 million shoppers visit Amazon.com, either by typing the address into their browser or by clicking through from another web site (host). Question of interest: Which hosts send the most visitors to Amazon’s website? (So that Amazon can further decide whether it’s worthwhile to pay more to keep links on certain busy sites.)
Image of page 2
lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Bar Charts and Pie Charts Mode and Median lecture 4, Descriptive Statistics for Categorical Data Data Date Purchase Amount ($) Host Region . . . . . . . . . . . . . . . 21Sep2002 No 0 yahoo.com Northeast 21Sep2002 Yes 65.97 msn.com West 21Sep2002 Yes 10.00 google.com South 22Sep2002 No 0 Midwest 22Sep2002 Yes 25.10 yahoo.com Northeast 22Sep2002 Yes 125.08 Midwest . . . . . . . . . . . . . . . 1 Data set consists of 188,996 visits To answer the question of interest we must describe the distribution of Host Host is a categorical variable 1 The Host field is left blank when the customer typed amazon.com into a browser.
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Bar Charts and Pie Charts Mode and Median lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Frequency and Relative Frequency Tables For categorical data, names identify the different categories This data can be summarized using a frequency table : A table that summarizes the number of items (frequency) in each of several non-overlapping classes or a relative frequency table : A table that summarizes the proportion of items in each class For each class, proportion =relative freqency= the frequency of the class divided by the total number of observations
Image of page 4
lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Bar Charts and Pie Charts Mode and Median lecture 4, Descriptive Statistics for Categorical Data Frequency and Relative Frequency Tables Frequency and Relative Frequency Tables
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern