RM ANOVA missing data
Dear colleagues,
I have a dataset with 60 participants, evaluating tapping synchronization skills. Some of the participants had no tapping events, so I have columns with empty cells. Tapping was measured in 3 different times. I want to conduct RMANOVA with time as within-subjects factor and intervention type as between-subjects.
While descriptives in JASP give the right number of responses, when I use the ANOVA I have missing values.
For example, instead of 30 responses, JASP calculates F for 14 values.
Why is this happening?
thank you very much in regard,
Martha
Comments
With repeated measures ANOVA you get listwise deletion, i.e. any observation with a missing data anywhere on your 3 assessments will be removed from the analysis. This is not specific to JASP.
You should look into mixed effects models instead. Take a look at the mixed menu in JASP.