  The method of analytic continuation from imaginary to real chemical potential
is one of the most powerful tools to circumvent the sign problem in lattice
QCD. Here we test this method in a theory, 2-color QCD, which is free from the
sign problem. We find that the method gives reliable results, within
appropriate ranges of the chemical potential, and that a considerable
improvement can be achieved if suitable functions are used to interpolate data
with imaginary chemical potential.
