Steps in Fixed Effects Model For Sample Data
- Calculate group and grand means
- Calculate k=number of groups, n=number of observations per group, N=total number of observations (k x n)
- Calculate SS-total (or total variance) as: (Each score - Grand mean)^2 then summed
- Calculate SS-treat (or treatment effect) as: (Each group mean- Grand mean)^2 then summed x n
- Calculate SS-error (or error effect) as (Each score - Its group mean)^2 then summed
- Calculate df-total: N-1, df-treat: k-1 and df-error k(n-1)
- Calculate Mean Square MS-treat: SS-treat/df-treat, then MS-error: SS-error/df-error
- Calculate obtained f value: MS-treat/MS-error
- Use F-table or probability function, to look up critical f value with a certain significance level
- Conclude as to whether treatment effect significantly affects the variable of interest
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