Table 2.
Post hoc power analyses for number of sessions attended and PHQascores.
|
|
Number of sessions attended | PHQ scores |
| Test | t tests / Means: difference between two independent means (two groups) | F tests / ANOVA: Repeated measures, within-between interaction |
| Analysis | Post hoc: Compute achieved power | Post hoc: Compute achieved power |
| Inputs | ||
|
|
Tail(s)=Two | Effect size f=0.0708881 |
|
|
Effect size d=0.3326908 | α err prob=0.05 |
|
|
α err prob=0.05 | Total sample size=203 |
|
|
Sample size group 1=157 | Number of groups=2 |
|
|
Sample size group 2=45 | Number of measurements=2 |
|
|
|
Correlation among repeated measures=0.257 |
|
|
|
Nonsphericity correction ε=1 |
| Output | ||
|
|
Noncentrality parameter δ=1.9675292 | Noncentrality parameter λ=2.7458948 |
|
|
Critical t=1.9718962 | Critical F=3.8881392 |
|
|
df=200 | Numerator df=1.0000000 |
|
|
Power (1-β err prob)=0.4992920 | Denominator df=201 |
|
|
|
Power (1-β err prob)=0.3781274 |
aPHQ: Patient Health Questionnaire