# The relationship between structural budget balance and cyclically adjusted budget balance?

What is the relationship between structural budget balance and the cyclically adjusted budget(CAB) balance?

I know that $PB=\textit{CAB}+AS$, where $PB$ is primary budget, and $AS$ are the automatic stabilizers(tax revenues, unemployment benefits, etc. $AS$ term is counter-cyclical, i.e negative in recessions, positive in booms).

My question is, how do I relate, mathematically, the structural budget and the CAB?

Any help would be appreciated.