  Gamma-gamma angular correlation measurements are a powerful tool for
identifying the angular momentum (spin) of excited nuclear states involved in a
$\gamma$-ray cascade, and for measuring the multipole orders and mixing ratios
of transitions. Though the physical angular correlations are fully calculable
from first principles, experimental effects can make the extraction of
coefficients and thus conclusions about spins and mixing ratios difficult. In
this article we present data analysis techniques developed for the clover
detectors of the GRIFFIN spectrometer at TRIUMF-ISAC combined with GEANT4
simulations in order to extract accurate experimental results.
