  In this paper we extend the promotion cure rate model proposed by Chen et al
(1999), by incorporating excess of zeros in the modelling. Despite allowing to
relate the covariates to the fraction of cure, the current approach, which is
based on a biological interpretation of the causes that trigger the event of
interest, does not enable to relate the covariates to the fraction of zeros.
The presence of zeros in survival data, unusual in medical studies, can
frequently occur in banking loan portfolios, as presented in Louzada et al
(2015), where they deal with propensity to fraud in lending loans in a major
Brazilian bank. To illustrate the new cure rate survival method, the same real
dataset analyzed in Louzada et al (2015) is fitted here, and the results are
compared.
