“…For example, some literature used the number of Internet users (net) as an indicator measuring information technology, the number of landline and mobile phone users (tele) as an indicator measuring the use of communication tools [6,11,14], and the industrial added value of telecommunication services (ICTP) measuring the development of ICT industry [13]; the other is to synthesize a comprehensive indicator. Concerning studies combined several indexes such as Internet broadband, Internet users, landline and mobile phone, and computer users into one index to measure the development of ICT based on the principal component analysis (PCA) [12,21,35,61]. Referring to the existing literature and improve its practice, this study chooses Internet users (net), landline, and mobile phones per 100 people (tele) and the industrial added value of telecommunication services (ICTP) to measure the three specific performance of the development of ICT, respectively.…”