协整方程怎么写啊？

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求高人指点，协整检验结果如下：
问题：1，为什么没有常数C呢，是我的检验方法有问题？
          2，如果正确，那么协整方程是多少？

Date: 03/04/14   Time: 20:19
Sample (adjusted): 2004 2011
Included observations: 8 after adjustments
Trend assumption: Linear deterministic trend
Series: HP RM
Lags interval (in first differences): 1 to 1
Hypothesized		Trace	5 Percent	1 Percent
No. of CE(s)	Eigenvalue	Statistic	Critical Value	Critical Value
None **	0.977540	32.46957	15.41	20.04
At most 1	0.231017	2.101491	3.76	6.65
Trace test indicates 1 cointegrating equation(s) at both 5% and 1% levels
*(**) denotes rejection of the hypothesis at the 5%(1%) level
Hypothesized		Max-Eigen	5 Percent	1 Percent
No. of CE(s)	Eigenvalue	Statistic	Critical Value	Critical Value
None **	0.977540	30.36808	14.07	18.63
At most 1	0.231017	2.101491	3.76	6.65
Max-eigenvalue test indicates 1 cointegrating equation(s) at both 5% and 1% levels
*(**) denotes rejection of the hypothesis at the 5%(1%) level
Unrestricted Cointegrating Coefficients (normalized by b'*S11*b=I):
HP	RM
-0.000119	2.66E-10
0.000338	1.66E-10
Unrestricted Adjustment Coefficients (alpha):
D(HP)	283.3834	-476.8764
D(RM)	-5.46E+09	5.68E+08
1 Cointegrating Equation(s):		Log likelihood	-241.6626
Normalized cointegrating coefficients (standard error in parentheses)
HP	RM
1.000000	-2.23E-06
	(1.9E-07)
Adjustment coefficients (standard error in parentheses)
D(HP)	-0.033718
	(0.05908)
D(RM)	649520.1
	(85819.9)

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关键词：协整方程 coefficients unrestricted observations Integrating adjusted Series

应该跟你选择的检验形式有关系，另外Normalized cointegrating coefficients (standard error in parentheses)这一部分显示的就是协整方程啊，即  HP=-2.23E-06RM