DATA BERKALA
Persamaan Garis Trend Y = a + b X X = Variabel bebas (Independent Variable) Y = Variabel tergantung (Dependent Variable) a = intercept (nilai Y ketika X = 0) b = kemiringan (slope) garis trend
Y = a + b X b = a =
Coding untuk tahun ganjil X (1) X – (2) Kode Waktu x (3) 2005 2005 – 2008 = -3 2006 2006 – 2008 = -2 2007 2007 – 2008 = -1 2008 2008 – 2008 = 2009 2009 – 2008 = 1 2010 2010 – 2008 = 2 2011 2011 – 2008 = 3 ∑X = 14.056
Coding untuk tahun genap X (1) X – (2) Kode Waktu x (3) 2005 2005 – 2007,5 = -2,5 x 2 = -5 2006 2006 – 2007,5 = -1,5 x 2 = -3 2007 2007 – 2007,5 = -0,5 x 2 = -1 2008 2008 – 2007,5 = 0,5 x 2 = 1 2009 2009 – 2007,5 = 1,5 x 2= 3 2011 2010 – 2007,5 = 2,5 x 2= 5 ∑X = 12.045