Hello THUNDERRr,
You mean to say Regression analysis of Circuit in AWR Microwave Office (MWO)...
Then Yes, it possible to do Regression Analysis using Parameter sweeps of variables or Statistical analysis using Monte Carlo Simulations (Yield Analysis)...
There are couple of Examples on Swept Variable analysis & Yield analysis using MWO available in the installation folder...
Also Go through the Getting Started & User Guides of MWO on Yield Analysis & Optimization...
---manju---