code: def logplr(self):
          
          logp = self.logprior
          if logp == -numpy.inf:
              return logp
          else:
              return logp + self.loglr
docs: Returns the log of the prior-weighted likelihood ratio at the
          current parameter values.
  
          The logprior is calculated first. If the logprior returns ``-inf``
          (possibly indicating a non-physical point), then ``loglr`` is not
          called.