PSYO 2090 Lecture : PSYO2090 Jan 30 2013.doc

• School: Dalhousie University
• Department: Psychology
• Course: PSYO 2090
• Professor: Tim Jukes

Document Summary

No risk of attrition of practice effects. More sessions could lead to dropout or have had practice at the test by know what to expect (repetitive) Not watching the same group over their period of development cannot be sure they. Example: measure kids, ages 6, 7, 8, and 9 years old. Same group over a period of development (time) Measuring the same group over time at different ages. Can measure general trends and individual differences. Really bad if you lose a critical group of people that are dropping out. See pg 47 i. e. : high achievers or low achievers the results will be unbalanced. Improvement could be due to the repetitive nature of the tests and knowing what to expect. Two or more groups (e. g. different ages) at t1 (time 1) Example: t1: 6, 7, 8, 9, 10. Cannot encourage or control subject, you cannot know exactly what they are thinking.