This study aims to use gray models to predict abnormal stock returns. Design/methodology/approach Data are collected from listed companies in the Tehran Stock Exchange during 2005-2015. The analyses portray three models, namely, the gray model, the nonlinear gray Bernoulli model and the Nash...

Purpose This study aims to use gray models to predict abnormal stock returns. Design/methodology/approach Data are collected from listed companies in the Tehran Stock Exchange during 2005-2015. The analyses portray three models, namely, the gray model, the nonlinear gray Bernoulli model and the...

Culture may be defined as ‘the collective programming of the mind which distinguishes the members of one human group from another’. Each human group shares its own social norms, consisting of common characteristics, such as a value system which is adopted by the majority of constituents....