Dear Allstaters:
Can you help me to distinguish between a split plot and a nested designs? What makes the difference between these two designs? Is the following:
Evaluator 1 Evaluator 2 Evaluator 3
subj1 subj2 subj1 subj2 subj1 subj2
school1
class1 A B A B B B
class2 B B C A A B
class3 B A B B C C
school2
class1 C C A B A A
class2 B B B A B B
class3 A A A B C C
a split plot design or a nested design? Evaluators as well as schools are samples. The marks go to one student/class. Should I consider student1, student 2, etc... instead of class 1, class2, etc....? I would call this set up a random nested design with students nested within classes which are nested within schools.
Cheers,
Ray
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