Lecture 4 10.19.09

Lecture 4 10.19.09 - 10/19/09 Psych 100B Lecture 4 Ceiling...

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10/19/09 Psych 100B – Lecture 4 Ceiling effects – how high can a person score (can’t be higher than 100). Floor effects – how low a subject can score (can’t be lower than 50). o Example: scale that weighs people Likert scale : How likeable/trustworthy a person is. Neutral description N + P.T. (positive trait) N + P.T. + P.B. (positive behaviour) Rate a person on a scale from 1 to 3. 1 2 3 below average above average This is not enough information for efficient data. You have to make sure that you don’t introduce ceiling or flooring effects, that is use a scale from 1 to 5 or more! Factorial Design – two or more levels of two or more IVs which are crossed with all levels of the IV. 1. Between-subjects: different groups in each condition 2. Within-subjects: a group is exposed to all conditions
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3. Mixed design: 3 main reasons for doing factorial design: 1. We can conduct 2 simple one-way designs (or experiments) simultaneously. 2.
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This note was uploaded on 03/07/2011 for the course PSYCH 100B taught by Professor Staff during the Fall '01 term at UCLA.

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Lecture 4 10.19.09 - 10/19/09 Psych 100B Lecture 4 Ceiling...

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