JASP Descriptive Stats Output

erindancey

Hi there,

I have used JASP to do a 2- way repeated measures ANOVA. I am confused as the descriptive stats/descriptive plots with the ANOVA output differ from the overall descriptive stats. Any idea why?

Thanks!

Erin

EJ

Hi Erin,

If you are referring to the standard errors, this is because the ANOVA model uses a pooled error term. It would help to see screenshots indicating the difference, because right now your question is a little abstract :-)

Cheers,

E.J.

erindancey

MSLQ - learning.jasp

Hi E.J,

Thanks for your response! When I run the ANOVA I get an output table and descriptive stats, when I run the descriptive stats the results are slightly different. I am new to JASP so may have done something wrong. I have attached my screenshots and my file as the second screenshot is hard to see.

Thanks for your help,

Erin

JohnnyB

Hi @erindancey

I think this is due to different handling of the missing data. If you look at the sample size in each table, you will see that they differ (for week 1 it's 10 and 13 vs 5 and 12). The RM ANOVA excludes cases listwise, which means that if there is a missing value in (for instance) level 1, it will also not consider that person's observation for level 2. The descriptives do not do this (since it is not relevant for the model), so it will include that person's observation for level 2.

Kind regards,

Johnny

erindancey

Thanks @JohnnyB! This makes sense. I like how the ANOVA output includes descriptive plots but I don't think it represents the data as it does not include all my data points, is there a way to get this plot with the descriptive information in JASP?

Thanks again,

Erin

JohnnyB

Hi @erindancey ,

The line chart as it is given for the RM ANOVA is specific to that analysis, since it uses the full RM ANOVA model for creating the error bars (you can read more about that in the RM ANOVA helpfile). I'm afraid you cannot make the same plot in the descriptives. An alternative might be to create boxplots with a violin element/jittered data points (and optionally to use the plot editing to set the same axis limits), like below:

Or alternatively, you could look in the independent t-test for the raincloud plots, and do this for your columns separately:

Although this does not have the connecting lines, it does show the various descriptive statistics graphically.

Kind regards,

Johnny

erindancey

Thanks @JohnnyB, I appreciate the help