Post-Lecture1-2

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School
The University of Queensland **We aren't endorsed by this school
Course
STAT 2203
Subject
Statistics
Date
Aug 19, 2023
Pages
11
Uploaded by CountSummer2355 on coursehero.com
Lecture 1.2 Describing Data
Data as a spreadsheet Data is often stored in a table or spreadsheet. In this course, we will store data in CSV ( Comma Separated Values ) format. A statistical convention is to denote variables as columns and the individual items (or units) as rows. ID group age height 1 1 10 100 2 1 12 120 3 2 9 90 4 2 8 87 Probability Models and Data Analysis (STAT2203/7203 Semester 2, 2022) - Lecture 1.2 2
Types of variables Quantitative variables (take on numerical values): I Continuous - represent measurements that take values in a continuous range, e.g., one's height I Discrete - have only a finite/countable number of numeric possibilities, e.g., number of eggs one eats for breakfast Categorical/qualitative/factor variables: I Nominal - represent groups without order, e.g., "Yes/No", "Red/Blue/Green" I Ordinal - represent groups with order, e.g., "Monday/ . . . /Sunday", "Likert scale" Categories are often referred to as levels . Probability Models and Data Analysis (STAT2203/7203 Semester 2, 2022) - Lecture 1.2 3
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