ANOVA,

[hakmec]

Hi,

I used ANOVA with 1 within repeated factor (Session) and 2 between factors (B1 and B2) in Jamovi and I get these results: I could not reproduce the classic eta squared η², but there is no problems with η²G and η²p

I get almost the double value of η² when I use the equation. Can you help me understand which formula is used for η² to get the values in the tables?

Thank you

Hakim

Results
Repeated Measures ANOVA
Within Subjects Effects

Sum of Squares df Mean Square F p η²G η² η²p
Session 274 3 91.4 0.896 0.446 0.009 0.004 0.024
Session ✻ B1 1378 3 459.3 4.507 0.005 0.045 0.019 0.111
Session ✻ B2 780 3 260.0 2.551 0.059 0.026 0.011 0.066
Session ✻ B1 ✻ B2 476 3 158.8 1.558 0.204 0.016 0.007 0.041
Residual 11006 108 101.9
Note. Type 3 Sums of Squares
[3]

Between Subjects Effects

Sum of Squares df Mean Square F p η²G η² η²p

B1 107.3 1 107.3 0.215 0.646 0.004 0.002 0.006
B2 3358.1 1 3358.1 6.731 0.014 0.104 0.047 0.158
B1 ✻ B2 63.8 1 63.8 0.128 0.723 0.002 0.001 0.004
Residual 17961.3 36 498.9
Note. Type 3 Sums of Squares

[jonathon]

i think the calculations for these values is defined here:

https://github.com/jamovi/jmv/blob/master/R/ancova.b.R#L389-L391

cheers