jamovi

Hello,

jamovi is great for intro statistics. The handiness of many options, e.g. assumption checks for tests within test menus is great.
Normally for t-tests and one-way anova, it's easy to see descriptives including Ns for compared groups.
Not so for (factorial) ANOVA - could it be added to e.g. marginal means' plots and tables?
On the other hand, there's no effect size measures in one-way anova menu, whereas it is in (factorial) ANOVA - is this possible to be added too?

Inclusion of the Ns is a good idea. But what statistic did you have in mind as an index of the effect size for a oneway Welch's (i.e., unequal-variance) ANOVA?

There is also a classic ANOVA option for one-way.
If there is no agreement on what to use for Welch's, then it needn't have one.