The formulas of easy methods on calculating total effects for regression analysis by effects induced from fractional factorial experiment designs at three or four level factors in case of quantitative and equally spaced levels with 2n series of orthogonal arrays are as follows. All of the symbols are indicate the total effects of factors. 1. 2nX4 design(A : 4 level factor, C : 2 level factor) A1=- (2A1+A2) AlXCl=2A1C+A2C Aq=A3 AqXCl=-A3C Ac=A1-2A2 AcXCl=(-A1C-2A2C) 2. 2nX4m design(A, B : 4 level factors) AlXBl=4A1B1+2A1B2+SA2B1+A2B2 AcXBq=A1B3-2A2B3 AqXBl=-(2A3B1+A3B2) AlXBc=-2A1B1+4A1B2-A2B1+2A2B2 AcXBl=-2A1B1-A1B2+3A2B1+2A2B2 AqXBc=A3B1-2A3B2 AqXBq-A3B3 AcXBc=A1B1-2A1B2-2A2B1+4A2B2 3. 2nX3m design (A, B : 3 level factors, C : 2 level factor) Al=-1/2(A1+A2) AlXBl=1/4(A1B1+A1B2+A2B1+A2B2) Aq=A3 AqXBl-1/2(A3B1+A3B2) AlXCl=1/2(A1C+A2C) AlXBq=-1/2(A1B3+A2B3) AqXCl=-A3C AqXBQ=A3B3 4. 2nX4X3 design(A : 4 level factor, B : 3 level factor) AlXBl=1/2(2A1B1+2A1B2+A2B1+A2B2) AlXBq=-(2A1B3+A2B3) AqXBl=-1/2(A3B1+A3B2) AqXBq=A3B3 AcXBl=-1/2(A1B1+A1B2-2A2B1-2A2B2) AcXBq=A1B3-2A2B3