Dummy variables	Significant level 5%			Significant level 10%
Dummy variables	No. of significant	No. of significant and positive	No. of significant and negative	No. of significant	No. of significant and positive	No. of significant and negative
b1	31	18	13	40	24	16
b2	50	4	46	67	7	60
b3	26	16	10	48	27	21
b4	38	16	22	50	20	30
b5	34	11	23	52	14	38
Total	179	65	114	257	92	165