code: def fit_conditional(self, alpha):
      y = self.ar1filter(self.endog, alpha)
      x = self.ar1filter(self.exog, alpha)
      res = OLS(y, x).fit()
      return res.ssr
  
file_path: statsmodels/statsmodels/sandbox/regression/ar_panel.py
imports: import numpy
  from scipy import optimize
  from statsmodels.regression.linear_model import OLS
label_desc: Use image node_id 3 for calling the PanelAR1 obj's underlying member method code with example usage: obj.fit_conditional(alpha) and returns: res