Class Notes (943,186)
CA (551,717)
U of G (28,122)
FRHD (1,607)
FRHD 3070 (131)
Hendry (25)
Lecture 13

FRHD 3070 Lecture 13: Lecture 13
Premium

2 Pages
19 Views

Department
Family Relations and Human Development
Course Code
FRHD 3070
Professor
Hendry

This preview shows half of the first page. Sign up to view the full 2 pages of the document.
Results of Factorial Designs
Main Effects
Determining if an independent variable has had an effect on the dependent variable while ignoring the
other independent variables in the design
Main effect - separate effects of each independent variable regardless of the other independent
variable
For each independent variable, you may have a main effect
E.g., A 2 X 2 factorial designs yields 2 main effects, one for each factor
A main effect is an outcome that is a consistent difference between levels of an IV.
The row mean differences depict the main effect for one factor
For istace, we would say there’s a ai effect for cotet if we fid a statistical difference
between the averages for the <1, <5, and >5 groups at both levels of pacing.
The column mean differences depict the main effect for the second factor
Alterately, we would say there’s a ai effect for duratio if we fid a statistical difference
between the averages for the different pacing groups at all levels of duration.
Interactions
Occur when the effect of one independent variable depends on the levels of another independent
variable
An interaction represents the joint effect of the IVs on the DV.
An interaction effect is depicted in a graph by the presence of nonparallel data lines, or lines that cross
or appear to cross at some time in the future.
How do you detect interactions?
1. Statistical analysis will report on all main effects and interactions.
2. When can't talk about effect on one factor without mentioning the other factor. When you
have an interaction it is impossible to describe your results accurately without mentioning both
factors.
3. You can identify an interaction in the graphs of group means: whenever there are lines that are
not parallel there is an interaction present.
Note that an interaction effect can occur when:
There are no main effect(s) for any independent variable (as in the above example)
There is a main effect for independent variable A but not B;
There is a main effect for independent variable B but not A
find more resources at oneclass.com
find more resources at oneclass.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Results of Factorial Designs Main Effects Determining if an independent variable has had an effect on the dependent variable while ignoring the other independent variables in the design Main effect - separate effects of each independent variable regardless of the other independent variable For each independent variable, you may have a main effect E.g., A 2 X 2 factorial designs yields 2 main effects, one for each factor A main effect is an outcome that is a consistent difference between levels of an IV. The row mean differences depict the main effect for one factor For instance, we would say theres a main effect for content if we find a statistical difference between the averages for the <1, <5, and >5 groups at both levels of pacing. The column mean differences depict the main effect for the second factor Alternately, we would say theres a main effect for duration if we find a statistical difference between the averages for the different pacing groups at all levels of duration. Interactions Occur when the effect of one independent variable depends on the levels of another independent variable An interaction represents the joint effect of the IVs on the DV. An interaction effect is depicted in a graph by the presence of nonparallel data lines, or lines that cross or appear to cross at some time in the future. How do you detect interactions? 1. Statistical analysis will report on all main effects and interactions. 2. When can't talk about effect on one factor without mentioning the other factor. When you have an interaction it is impossible to describe your results accurately without mentioning both factors. 3. You can identify an interaction in the graphs of group means: whenever there are lines that are not parallel there is an interaction present. Note that an interaction effect can occur when: There are no main effect(s) for any independent variable (as in the above example) There is a main effect for independent variable A but not B; There is a main effect for independent variable B but not A There is main effect for independent variables A and B Why Use a Facto
More Less
Unlock Document


Only half of the first page 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

Don't have an account?

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