- factor levels sample from larger population
- example
o several hundred stores
o seven chosen at random
o sample of employees chosen at each store
- example
o 8 employees selected at random from each of the 5 depts in each store
o interest now in employee evaluation of mgt by dept and store
o stores – random factor
o depts. – fixed factor
- repetition would involve new sample which would probably consist of different subjects
- Yij = ui + ξij
- factor level means – random variables
- difference between two models (fixed and random effects) appears in expected mean squares
-
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