Qiao, Guangshun - In: Economics : the open-access, open-assessment journal 17 (2023) 1, pp. 1-11
This article tries to estimate the operating efficiency among 30 years (1989-2018) in the information technology (IT) industry, where technologies are everchanging. The balanced panel data model of Kneip et al. is extended to an unbalanced panel data model for more generic applications. The...
