Class Notes (839,574)
Canada (511,407)
Psychology (6,277)
Lecture

4)Lec-Experiments.docx

3 Pages
50 Views

Department
Psychology
Course Code
Psychology 2810
Professor
Doug Hazlewood

This preview shows page 1. Sign up to view the full 3 pages of the document.
Description
Measurement 1 Definitions and Levels Prologue: Background Review - Concepts (constructs) are words (can’t be directly observed; must be translated into things that can be observed) - Operational definitions describe how concepts will be ‘measured’ (or ‘manipulated’- the purpose of operational definitions is to transfer things that are words into things that can be studied - We’ll talk about ‘manipulating’ concepts when we discuss experiments - Skim Ch 5’s discussion of independent, dependent, subject, and confounded variables (p. 120-122) - Skip nuts and bolts (134-135; case in point and reading between the lines (137) and exercises 5.2 - 5.10 Part 1: Definitions Measurement - using rules to assign values to variables - Values can be numbers or names - Variable - any observable attribute of a concept that has more than one value Biological sex: Males, Females Exam grade: 0% - 100% correct Part 2: Types of Variables A. Categorical variables (values identify distinct “categories” of things) - Values can be names (e.g., males, females) - Values can be numbers (males = 1, females = 2) -Necessary when analyzing data (SPSS) -Numbers don’t have a numerical meaning (don’t tell us about ‘quantity’ - they are just labels in this content) -Numbers can be used to identify individuals within categories (e.g., SIN, student #) B. Quantitative variables (values are numbers that represent quantity; e.g., exam grades) Can be: - Continuous: values represent quantity with no gaps between values (e.g., height, weight) - Discrete: have gaps between values (e.g., can get 70 or 71 answers correct on MC exam, but not 70.5 - Values can be words (e.g., “high” vs “low”, represent quantity: low = 1, high = 2) C. Measurement involves using rules to assign values to variables Part 3: Level of Measurement (and Measurement Scales) A. Nominal scales (name categories of things) - Information: observations are ‘same’ or ‘different’ (equal or not equal) - Rule: same things get same nominal value; different things get different nominal value Note: - ‘categorical’ variables are always nominal - values can be names or numbers (numbers don’t indicate ‘quantity’), BUT we can count the number of things in each category B. Ordinal scales (provide ‘quantitative’ info) - Information: same-different PLUS more-less (rank-order or relative magnitude) - Rule: rank order of scale values must represent rank-order of magnitudes on dimension be
More Less
Unlock Document

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit