Results

ANCOVA

ANCOVA - Amplitude
 Sum of SquaresdfMean SquareFpη²p
Condition489.82244.920.52< .0010.339
Stim23.2123.21.940.1670.024
Residuals954.68011.9   
[3]

 

Assumption Checks

Homogeneity of Variances Tests
 Statisticdfdf2p
Levene's0.7842810.460
Bartlett's1.622 0.445
Note. Additional results provided by moretests

 

Normality tests
 statisticp
Shapiro-Wilk0.9880.620
Kolmogorov-Smirnov0.05810.924
Anderson-Darling0.3270.515
Note. Additional results provided by moretests

 

Q-Q Plot

Post Hoc Tests

Post Hoc Comparisons - Condition
Comparison
Condition ConditionMean DifferenceSEdftptukey
Mo_AP-Mo_LM5.601.02180.05.49< .001
 -Mo_PA6.691.11980.05.98< .001
Mo_LM-Mo_PA1.090.94480.01.150.485
Note. Comparisons are based on estimated marginal means

 

[4]

Scatterplot

References

[1] The jamovi project (2022). jamovi. (Version 2.3) [Computer Software]. Retrieved from https://www.jamovi.org.

[2] R Core Team (2021). R: A Language and environment for statistical computing. (Version 4.1) [Computer software]. Retrieved from https://cran.r-project.org. (R packages retrieved from MRAN snapshot 2022-01-01).

[3] Fox, J., & Weisberg, S. (2020). car: Companion to Applied Regression. [R package]. Retrieved from https://cran.r-project.org/package=car.

[4] Lenth, R. (2020). emmeans: Estimated Marginal Means, aka Least-Squares Means. [R package]. Retrieved from https://cran.r-project.org/package=emmeans.