Model 5
graph LR;
A --> C;
A --> B --> D3{ } --> C;
A --> D3{ };
Its definition file
Setting up the models for analysis
Out = ['', 'B', 'C']
In = [[],['A'],['A','B']]
Inter = [ [[]], [[]], [['A','B']] ]
Estimating the regression equations
regstats(B,[A])
regstats(C,[A B dA*dB])