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tokens: ACKNOWLEDGEMENTS We would like to thank the referee for a constructive and useful comments on the manuscript. AK is very grateful to Rick Kessler and Dan Scolnic for many enlightening discussions on the cosmological analyses using supernovae type Ia samples and effects of survey selection function. AK was supported by a NASA ATP grant NNH12ZDA001N, NSF grant AST-1412107, and by the Kavli Institute for Cosmological Physics at the University of Chicago through grant PHY-1125897 and an endowment from the Kavli Foundation and its founder Fred Kavli. EJ is supported by the Argonne Leadership Computing Facility, a U.S. Department of Energy, Office of Science User Facility operated under Contract DE-AC02-06CH11357. CM and JW were supported by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research (ASCR) under Contract DE-AC02-06CH11347. JW was also supported by ASCR through award DE-SC0014205. Numerical experiments presented in this paper were carried out on the midway computing cluster maintained by the University of Chicago Research Computing Center. We acknowledge the Center and its staff for support.