我想问点了eviews5.1中的view菜单的fixed/random effects testing中的hausman test以后，出来了结果，把固定效应和随机效应放在了一起。他们后边的p值和单独做fixed或random时候好像不一样，比单独做时候显著多了。这是怎么一回事呢? 我把结果放在了附件中，hausman检验后的R平方怎么0.9呢？拟合度有那么好吗？

Hausman test result
Correlated Random Effects - Hausman Test
Pool: Untitled
Test period random effects
Test Summary		Chi-Sq. Statistic	Chi-Sq. d.f.	Prob.
Period random		156.513	28	0
Period random effects test comparisons:
Variable	Fixed	Random	Var(Diff.)	Prob.
1--V1	-0.00477	-0.00376	0	0
2--V2	0.005793	0.006349	0	0
3--V3	-0.01804	-0.01776	0	0
4--V4	-0.02557	-0.02525	0	0.0004
5--V5	0.004104	0.005025	0	0
6--V6	0.009208	0.010019	0	0
7--V7	0.000145	0.000816	0	0
8--V8	0.000991	0.001054	0	0.0496
9--V9	0.052397	0.053066	0	0
10--V10	0.011705	0.012427	0	0
11--V11	-0.00285	-0.00197	0	0
12--V12	0.017872	0.01797	0	0.1645
13--V13	-0.00192	-0.00192	0	0.7392
14--V14	-0.00952	-0.00921	0	0
15--V15	0.006455	0.008052	0	0
16--V16	-0.00325	-0.00317	0	0.0351
17--V17	0.005248	0.005611	0	0
18--V18	0.013954	0.014929	0	0
19--V19	0.002387	0.002889	0	0
20--V20	0.002448	0.002463	0	0.8654
21--V21	0.012247	0.012807	0	0
22--V22	0.016078	0.017227	0	0
23--V23	0.001003	0.001981	0	0
24--V24	-0.00503	-0.00476	0	0
25--V25	-0.0029	-0.00269	0	0.0003
26--V26	0.008157	0.008817	0	0
27--V27	-0.00477	-0.00449	0	0.0001
28--V28	0.003081	0.003361	0	0
Period random effects test equation:
Dependent Variable: I?
Method: Panel Least Squares
Date: 05/26/07 Time: 20:13
Sample: 1 67
Included observations: 67
Cross-sections included: 28
Total pool (unbalanced) observations: 1851
Variable	Coefficient	Std. Error	t-Statistic	Prob.
C	0.010665	0.000377	28.31502	0
1--V1	-0.00477	0.010527	-0.45272	0.6508
2--V2	0.005793	0.009119	0.63528	0.5253
3--V3	-0.01804	0.006325	-2.85254	0.0044
4--V4	-0.02557	0.008662	-2.95158	0.0032
5--V5	0.004104	0.01136	0.361277	0.7179
6--V6	0.009208	0.011371	0.80981	0.4182
7--V7	0.000145	0.01073	0.013483	0.9892
8--V8	0.000991	0.003203	0.309505	0.757
9--V9	0.052397	0.00942	5.562133	0
10--V10	0.011705	0.009971	1.1739	0.2406
11--V11	-0.00285	0.011366	-0.25053	0.8022
12--V12	0.017872	0.007151	2.49931	0.0125
13--V13	-0.00192	0.001574	-1.22177	0.222
14--V14	-0.00952	0.006055	-1.57143	0.1163
15--V15	0.006455	0.015341	0.420785	0.674
16--V16	-0.00325	0.003416	-0.95021	0.3421
17--V17	0.005248	0.005261	0.997383	0.3187
18--V18	0.013954	0.010911	1.278942	0.2011
19--V19	0.002387	0.00766	0.311633	0.7554
20--V20	0.002448	0.008701	0.281369	0.7785
21--V21	0.012247	0.006881	1.779831	0.0753
22--V22	0.016078	0.012707	1.265297	0.2059
23--V23	0.001003	0.011153	0.089959	0.9283
24--V24	-0.00503	0.002984	-1.68649	0.0919
25--V25	-0.0029	0.005667	-0.51124	0.6093
26--V26	0.008157	0.011087	0.735738	0.462
27--V27	-0.00477	0.007072	-0.67457	0.5
28--V28	0.003081	0.004805	0.641315	0.5214
	Effects Specification
Period fixed (dummy variables)
R-squared	0.977945	Mean dependent var		0.010772
Adjusted R-squared	0.976764	S.D. dependent var		0.105197
S.E. of regression	0.016035	Akaike info criterion		-5.37807
Sum squared resid	0.451528	Schwarz criterion		-5.09459
Log likelihood	5072.408	F-statistic		828.3292
Durbin-Watson stat	2.111484	Prob(F-statistic)		0

怎么又出来个虚拟变量呢？怎么回事哦？？