  A simple method for numerical analytic continuation is developed. It is
designed to analytically continue the imaginary time (Matsubara frequency)
quantum Monte Carlo simulation results to the real time (real frequency)
domain. Such a method is based on the Pad\'e approximation. We modify it to be
a linear regression problem, and then use bootstrapping statistics to get the
averaged result and estimate the error. Unlike maximum entropy method, no prior
information is needed. Test-cases have shown that the spectrum is recovered for
inputs with relative error as high as 1%.
