Task 9 Flashcards
Which 2 types of designs does a within-subject design have?
Single Factor Two-level Design
Single Factor Multilevel Design
What is a Single Factor Two-level Design?
2 levels of independent variable
all subjects receive both treatments
half of the group AB; half BA
When do you use a Single Factor Two-level Design?
when individual differences are the main source of variance
you can’t afford to test many subjects
assessing effects of increasing exposure on behavior
What is a single Factor Multilevel Design?
3 or more levels of independent variables
counterbalancing
Latin square (to reduce number of orders)
if independent variable is cumulative: practice session or breaks
Which design do you use if subject related variables should be controlled?
Matched / within design
Which design do you use if carryover potential problems
Matched design
Which design do you use if subject related variables are not impactful?
Randomized Group Design
What is the idea of a factorial design; explain with an example?
several independent variables
2x2x3=3 variables with 2,2,3 levels respectively
- Measuring the efficacy of 2 treatments (A,B), under consideration of gender (m,f) and 3 levels of socio- economic- status (low, average, high)
- There will be a total of 12(2x2x3) groups
When do you use a factorial design?
When more independent variables are of interest
if controls for carryover effect is needed, the treatment order can be treated as an additional independent variable
What do main effects do? How do they look like?
effect of one of the independent variables on the dependent
1 Main effect: rising or falling together
2 main effect: rising or falling separately but lines are parallel
What is the interaction effect?
effect of one independent variable changes depending on the level of another independent variable
May still have simple main effects
Strong convergence
lines cross
How to calculate Interaction effects ?
subtracting cells within column
Die Zellen die in einer Spalte sind
How to calculate Main effects?
rechne die Zellen aus der Zeile zusammen und teile sie durch 2
Factorial design
Design that incorporates two or more independent variables in one experiment
Each independent variable is referred to as a factor, each factor includes at least two levels
It allows you to assess the effect of each independent variable on the dependent variable separately
Separate effects of each independent variable are known as main effects
You can also assess whether a complex relationship exists or not, this is called interaction
interaction is the same like..
moderation
