Lecture 14 Repeated Measures Designs

Lecture 14 Repeated Measures Designs - Repeated Measures...

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Repeated Measures Designs Lecture 14
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Today Repeated Measures conceptual  background (sometimes called  dependent samples) Dependent samples t test Repeated measure ANOVA
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Assumptions of t & F Normality  – the populations are  normally distributed Homogeneity of variance  – the groups  have similar amounts of variance within  the groups Independence  – a person is only in  one group and not related to the person  in the other group
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Independent vs. Dependent Samples Independent sample DV Score from one group cannot be logically  paired with the other group. The groups are not related to one another;  subjects can only be in one group Dependent sample Experimental design in which scores from  each group are logically matched in some  way.
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Types of Dependent Samples Natural pair Example: twin pairs, siblings, parent &  child, spouses Matched pair Example: matched on age, gender,  ethnicity, and location Repeated measures Same person is measured two or more  times
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Comparing independent and  dependent samples Independent samples 2 unrelated groups People in group 1 are  randomly selected  from the population People in group 2 are  randomly selected  from the population Dependent samples The groups are related  in some way A pair is randomly  chosen from the  population, and 1 person  is put in group 1, the  other in group 2 Or, a person in group 1  is related in same way  (or is the same person)  as in group 2
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Are the following independent or paired? 10 sets of twins are brought into the lab; 1 is randomly  placed in group 1 and the other is placed in group 2. 14 people were randomly assigned to an experimental or  treatment group. 15 individuals with asthma were studied for the effects of  laughter on breathing. As a control, 15 healthy  individuals, matched on age, sex, and family size, were  examined as well.  30 participants took a test; scores were compared to an  established mean value. 30 participants took a test, went through a treatment,  then retook the test and the effects of the treatment were  examined.
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Are the following independent or paired? 10 sets of twins are brought into the lab; 1 is randomly placed in group 1  and the other is placed in group 2. Paired (twins are naturally matched) 14 people were randomly assigned to an experimental or treatment group.
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Lecture 14 Repeated Measures Designs - Repeated Measures...

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