Regression Expression using Groups

Question

hi guys,

 

 

 

       i have some doubts in Regression format by using Group:

 

 

   Assume:if i have  3 groups 0,1,2

 

  group 0:Represent the Whole match

 

 group1 : first expression grouping

 

 group2 : second expression grouping

 

 

How to do this in my text box .

 

 

 

Please help for this ,