Lecture 8: Control
10/26/05, 10/31/05
- Between vs. Within
- What is a between-subjects design?
- What is a within-subjects design?
- Between-Subjects Design
- When should you use this?
- What are the disadvantages?
- Creating Equivalent Groups
- What is Random Assignment?
- What is Block Randomization?
- What is matching?
- Within-Subjects Design
- Advantages
- Sequence effect (order effect)
- progressive effects
- carryover effect
- Controlling Sequence Effects
- counterbalancing
- When only testing each condition once
- Complete Counterbalancing
- Partial Counterbalancing
- Latin Square - special case of partial counterbalance
- Testing each condition more than once
- Reverse counterbalancing
- Block Randomization
- Problems w/ counterbalancing
- assumes that the benefit (or detriment) one gets from
- This is known as asymmetric transfer
- Control & Developmental Research
- Age is often an IV (subject variable)
- What is a cross-sectional design?
- What is a longitudinal design?
- Sequential design
- Biasing Problems
- Experimenter Bias
- Might inadvertently treat people in different conditions in different ways beyond experimental manipulation
- Different experimenters for each condition?
- How to solve?
- Mechanize procedures
- What is the double blind procedure?
- What is participant bias?
- Behaving in ways they think the experimenter is expecting (or hoping for) them to
- What is the Hawthorne effect?
- What are demand characteristics?
- What is evaluation apprehension?
- How to fix?
- Reduce demand characteristics
- Manipulation checks
Research
Methods Page
Last updated: 10/25/05