我正在尝试为GPower中的重复测量设计计算功率。我有信心我的设计作为单一测量ANOVA得到了正确的结果: 2个因素,每个3个级别:
F tests - ANOVA: Fixed effects, special, main effects and interactions
Analysis: A priori: Compute required sample size
Input: Effect size f = .4
α err prob = 0.05
Power (1-β err prob) = .8
Numerator df = 2
Number of groups = 6
Output: Noncentrality parameter λ = 10.240000
Critical F = 3.155932
Denominator df = 58
Total sample size = 64
Actual power = 0.803690
然后这是我重复msrs的设置:
F tests - ANOVA: Repeated measures, within-between interaction
Analysis: A priori: Compute required sample size
Input: Effect size f = .4
α err prob = 0.05
Power (1-β err prob) = .8
Number of groups = 6
Repetitions = 4
Corr among rep measures = 0.5
Nonsphericity correction ε = 1
Output: Noncentrality parameter λ = 30.720000
Critical F = 1.855810
Numerator df = 15.000000
Denominator df = 54.000000
Total sample size = 24
Actual power = 0.917180
问题是:重复的msrs作为单一测量,我的组编号是否相同? -are .5相关性和1非球面校正标准?这些参数是从设计中得出的吗?
谢谢!