  Aiming at quantifying and evaluating the regional commercial environment
along with the level of economic development among cities in mainland China,
the concept of China City Commercial Environment Credit Index(CEI) was first
introduced and established in 2010. In this manuscript, a historical review and
detailed introduction of CEI is included, followed by statistical studies. In
particular, an independent statistical cross-check for the existing CEI-2012 is
performed and significant factors that play the most in influential roles are
discussed.
