estimate the effect size for Post-hoc analyses 

Hi I wonder it is possible to estimate the effect size for post-hoc analyses and generate the plot as using the 'Estimate Indepednet mean Difference'?  I also found that 'Estimate Indepednet mean Difference' can only compare with 2 groups, it is possible to compare >2 groups? Let me know if I should open another issue for the latter question, Thanks! 