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HUDM 5123 - Linear Models and Experimental Design
HW 06 Random and Nested Factors
Instructions.
● Unless otherwise noted, assignments are due before the next lab class (i.e., in a week).
● You are encouraged to discuss problems with classmates, but all work you submit must be your own.
● If applicable, any plots should have appropriate axis and overall labels.
● In general, do not include computer output (either SPSS or R) in your write-up. Instead, summarize relevant points using text, tables, or plots.
● When in doubt about formatting issues (e.g., for references, tables, notes, etc.), use APA style.
Data. Two datasets were uploaded, "HW6_data_Item1.sav" and "HW6_data_Item2.sav" .
Task. For each dataset,
1. Describe whether each factor should be treated as a xed or a random factor, and explain why.
2. Anlyaze the data with the appropriate model.
3. Interpret your findings.
Study Design for Item 1. Suppose that a psychologist wants to evaluate the e ectiveness of biofeedback for treating hypertension, that is, for lowering blood pressure. The psycholo- gist designed a study with two groups: biofeedback training and no biofeedback. The study was implemented by three di erent research assistants. Each individual selected to partici- pate in the study were randomly assigned to work with one of the research assistants. All the inidviduals working with each research assistant were randomly assigned to one of the treatment groups: biofeedback or no biofeedback.
Y: blood pressure measure, BloodPressure
Factor A: biofeedback, biofeed
Factor B: research assistant, RA
Study Design for Item 2. : A researcher recruited 9 experienced clinicians to deliver one of three forms of psychotherapy, individual, group, or conjoint therapy, to clients diagnosed with an a ective, anxiety, adjustment, or personality disorder. Several instruments administered at termination of treatment following at least six therapy sessions were combined into a composite score of patient distress, with higher scores indicating greater distress. Assume the scores are the composite scores obtained at termination on seven clients seen by each of these nine therapists
Y: the composite score, composite
Factor A: treatment methods, modality
Factor B: therapist, therapist