panel data不能直接用lag length criterion。 GMM的sum of square可以用来weight模型。可是遇到个很大的问题,无论我的lag length是选1,2,3,4还是5。得到的sum of square都是30上下,没有big jump不知道怎么办,很急啊啊啊
有用GMM的同学么,请帮忙看看(我的panel data是两个variable,538个cross section,38个time period)
A
Lag 1 33.01899
Lag 2 33.55311
Lag 3 32.52414
Lag 4 30.84878
Lag5 29.83486
B lag1 158.4245
lag2 160.9157
lag3 155.6786
lag4 149.5894
lag5 136.2440
不知道我的模型有没有错
比如lag1 A当dependent variable的时候,independent variable我就选的A(t-1) B(t-1)常数和时间dummy variable
而且也不知道instrument怎么加,如果加上,sum of square更加没有big jump
for instance
Dependent Variable: A
Method: Panel Generalized Method of Moments
Transformation: First Differences
Date: 10/02/10 Time: 12:22
Sample (adjusted): 1973 2007
Periods included: 35
Cross-sections included: 538
Total panel (balanced) observations: 18830
White period instrument weighting matrix
White period standard errors & covariance (d.f. corrected)
Instrument list: @DYN(A,-2) A A(-1) A(
-2) A(-3) B(-1) B(-2) B(-3)
@LEV(@SYSPER)
Variable Coefficient Std. Error t-Statistic Prob.
A(-1) -0.008673 0.001662 -5.219493 0.0000
A(-2) -0.054881 0.001266 -43.34828 0.0000
A(-3) -0.011162 0.000634 -17.59607 0.0000
B(-1) -0.001182 0.001178 -1.003625 0.3156
B(-2) 0.010783 0.001829 5.896227 0.0000
B(-3) 0.007758 0.001130 6.863489 0.0000
@LEV(@ISPERIOD("1973")) 0.036532 0.001152 31.69921 0.0000
@LEV(@ISPERIOD("1974")) -0.004885 0.000465 -10.49623 0.0000
@LEV(@ISPERIOD("1975")) -0.002030 0.000386 -5.251594 0.0000
@LEV(@ISPERIOD("1976")) -0.014199 0.000513 -27.66525 0.0000
@LEV(@ISPERIOD("1977")) -0.013650 0.000364 -37.54621 0.0000
@LEV(@ISPERIOD("1978")) 0.016846 0.000286 58.95326 0.0000
@LEV(@ISPERIOD("1979")) 0.001405 0.000319 4.411952 0.0000
@LEV(@ISPERIOD("1980")) 0.015830 0.000501 31.61025 0.0000
@LEV(@ISPERIOD("1981")) -0.001400 0.000502 -2.789488 0.0053
@LEV(@ISPERIOD("1982")) -0.044384 0.000578 -76.78486 0.0000
@LEV(@ISPERIOD("1983")) -0.020260 0.000432 -46.92039 0.0000
@LEV(@ISPERIOD("1984")) 0.012220 0.000344 35.52046 0.0000
@LEV(@ISPERIOD("1985")) -0.044577 0.000359 -124.1857 0.0000
@LEV(@ISPERIOD("1986")) -0.025688 0.000451 -56.99584 0.0000
@LEV(@ISPERIOD("1987")) 0.004172 0.000472 8.830789 0.0000
@LEV(@ISPERIOD("1988")) 0.018285 0.000446 40.98522 0.0000
@LEV(@ISPERIOD("1989")) 0.036174 0.000528 68.44916 0.0000
@LEV(@ISPERIOD("1990")) -0.026178 0.000460 -56.89363 0.0000
@LEV(@ISPERIOD("1991")) 0.005907 0.000465 12.70309 0.0000
@LEV(@ISPERIOD("1992")) 0.006223 0.000373 16.68492 0.0000
@LEV(@ISPERIOD("1993")) -0.009373 0.000297 -31.50862 0.0000
@LEV(@ISPERIOD("1994")) 0.011384 0.000279 40.85932 0.0000
@LEV(@ISPERIOD("1995")) -0.004561 0.000401 -11.36706 0.0000
@LEV(@ISPERIOD("1996")) 0.004735 0.000347 13.65229 0.0000
@LEV(@ISPERIOD("1997")) 0.003255 0.000297 10.97664 0.0000
@LEV(@ISPERIOD("1998")) -0.004584 0.000331 -13.85367 0.0000
@LEV(@ISPERIOD("1999")) -0.022661 0.000324 -69.92821 0.0000
@LEV(@ISPERIOD("2000")) 0.026581 0.000379 70.19013 0.0000
@LEV(@ISPERIOD("2001")) -0.008789 0.000388 -22.62406 0.0000
@LEV(@ISPERIOD("2002")) -0.036380 0.000418 -87.05344 0.0000
@LEV(@ISPERIOD("2003")) 0.013257 0.000321 41.32528 0.0000
@LEV(@ISPERIOD("2004")) 0.003301 0.000524 6.294034 0.0000
@LEV(@ISPERIOD("2005")) -0.000900 0.000575 -1.565527 0.1175
@LEV(@ISPERIOD("2006")) 0.018320 0.000401 45.63402 0.0000
@LEV(@ISPERIOD("2007")) 0.008086 0.000332 24.33079 0.0000
Effects Specification
Cross-section fixed (first differences)
Period fixed (dummy variables)
Mean dependent var -0.001432 S.D. dependent var 0.043727
S.E. of regression 0.039314 Sum squared resid 29.03966
J-statistic 679.8457 Instrument rank 539.000000