“…The choice of kernel function is a critical decision for prediction efficiency. From the literature reviewed, it can be inferred that the Gaussian function Chen et al, 2006;Kim, 2003 Kim and Han (2000), Kim (2006), Leigh et al (2002), Majumder and Hussian (2007), Mizuno et al (1998), Nayak et al (2014), Pan et al (2005), Roman and Jameel (1996), Schierholt and Dagli (1996), Yao et al (1999), Yao and Poh (1995), Zhang and Wu (2009) Stock price prediction (20) Alkhatib et al (2013), Arasu et al (2014), Atsalakis and Valavanis (2009), Ayodele et al (2012), Chang and Liu (2008), Choudhry and Garg (2008), Dehghanpour and Esfahanipour (2017), Hargreaves and Hao (2013), Hammad et al (2009), Hsieh et al (2011), Kim and Han (2000), Kwon and Moon (2007), Lahmiri (2011, Ou and Wang (2009), Tjung et al (2010), Tsai and Wang (2009), Vaisla and Bhatt (2010), Versace et al (2004), Wunsch et al (1998) Predicting stock markets using external factors (7) Bollen et al (2011, Kuo et al (2001), Michael et al (2005), Mittal and Goel (2012), Shriwas and Sharma (2014), Thawornwong and...…”