Table 4.

Analysis of Taguchi's modeled results.

Code	L1	L2	L3	L2-L1	Contribution (%)
X1	1647.22	1050.33	1033.11	−596.89	8.94
X2	1788.44	1020	922.22	−768.44	12.07
X3	322.22	1809.56	1611.56	1487.33	12.53
X4	131.11	2104.22	1495.33	1973.11	19.07
X5	421.33	1599	1710.33	1177.67	10.34
X6	1915.89	896	918.78	−1019.89	14.89
X7	296.89	1459.44	1974.33	1162.56	16.19
X8	1513.89	1186.78	1030	−327.11	5.98
X9	3386.89	281.33	63	−3105.00	47.48

L1: the first level answer. L2: the second level answer. L3: the third level answer. L2-L1: the difference between the second level answer and the first level answer.