移動平均算出表
			1/2{1/4(Y1+Y2+Y3+Y4)+1/4(Y2+Y3+Y4+Y5)} =1/8(Y1+Y2+Y3+Y4)+1/8 (Y2+Y3+Y4+Y5) =1/4(1/2Y1 +Y2+Y3+Y4+1/2Y5)