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<p>SYS-GMM估计问题,AR(2)无值,紧急。。。。</p><p>在用STATA估计GMM时,AR(2)没有值,我用的数据是52个个体,2003-2006,4年的数据,因变量的滞后项有3年数据。</p><p>是不是时间4年太少了?但又没有更多时间的数据。 </p><p>如果是因为滞后项3期太少了,可以不可以在把因变量滞后而缺少的一年补齐,使因变量为2003-2006数据,因变量滞后项取2002-2005,两者都为四年呢???????</p><p>问题怎么解决,感谢赐教!</p><p><br/>. xtabond2 LJGG LRJSJ LRK LFCYBZ LMJ LRJSR LGZZS LLJGG, gmm(LLJGG, lag(2 3)) iv(LRJSJ LRK LFCYBZ LMJ LRJSR LGZZS) nom two<br/>Building GMM instruments..<br/>Estimating.<br/>Performing specification tests.</p><p>Dynamic panel-data estimation, two-step system GMM<br/>------------------------------------------------------------------------------<br/>Group variable: county&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Number of obs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 156<br/>Time variable : year&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Number of groups&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 52<br/>Number of instruments = 9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Obs per group: min =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br/>Wald chi2(6)&nbsp; =&nbsp;&nbsp;&nbsp; 620.77&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; avg =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3.00<br/>Prob &gt; chi2&nbsp;&nbsp; =&nbsp;&nbsp;&nbsp;&nbsp; 0.000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; max =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br/>------------------------------------------------------------------------------<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LJGG |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Coef.&nbsp;&nbsp; Std. Err.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; z&nbsp;&nbsp;&nbsp; P&gt;|z|&nbsp;&nbsp;&nbsp;&nbsp; [95% Conf. Interval]<br/>-------------+----------------------------------------------------------------<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LRJSJ |&nbsp;&nbsp; .0364959&nbsp;&nbsp; .0311399&nbsp;&nbsp;&nbsp;&nbsp; 1.17&nbsp;&nbsp; 0.241&nbsp;&nbsp;&nbsp; -.0245372&nbsp;&nbsp;&nbsp;&nbsp; .097529<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LRK |&nbsp; -.0807054&nbsp;&nbsp; .0538728&nbsp;&nbsp;&nbsp; -1.50&nbsp;&nbsp; 0.134&nbsp;&nbsp;&nbsp; -.1862942&nbsp;&nbsp;&nbsp; .0248834<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LFCYBZ |&nbsp; -.0482425&nbsp;&nbsp; .1101858&nbsp;&nbsp;&nbsp; -0.44&nbsp;&nbsp; 0.662&nbsp;&nbsp;&nbsp; -.2642028&nbsp;&nbsp;&nbsp; .1677177<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LMJ |&nbsp; -.0009994&nbsp;&nbsp; .0222245&nbsp;&nbsp;&nbsp; -0.04&nbsp;&nbsp; 0.964&nbsp;&nbsp;&nbsp; -.0445586&nbsp;&nbsp;&nbsp; .0425599<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LRJSR |&nbsp;&nbsp; .1027473&nbsp;&nbsp; .0540924&nbsp;&nbsp;&nbsp;&nbsp; 1.90&nbsp;&nbsp; 0.058&nbsp;&nbsp;&nbsp; -.0032719&nbsp;&nbsp;&nbsp; .2087664<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LGZZS |&nbsp;&nbsp; .2794209&nbsp;&nbsp; .1796872&nbsp;&nbsp;&nbsp;&nbsp; 1.56&nbsp;&nbsp; 0.120&nbsp;&nbsp;&nbsp; -.0727595&nbsp;&nbsp;&nbsp; .6316012<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LLJGG |&nbsp;&nbsp; .6958339&nbsp;&nbsp; .2078366&nbsp;&nbsp;&nbsp;&nbsp; 3.35&nbsp;&nbsp; 0.001&nbsp;&nbsp;&nbsp;&nbsp; .2884816&nbsp;&nbsp;&nbsp; 1.103186<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; _cons |&nbsp; -.1749919&nbsp;&nbsp; .5102016&nbsp;&nbsp;&nbsp; -0.34&nbsp;&nbsp; 0.732&nbsp;&nbsp;&nbsp; -1.174969&nbsp;&nbsp;&nbsp; .8249849<br/>------------------------------------------------------------------------------<br/>Warning: Uncorrected two-step standard errors are unreliable.</p><p>Instruments for first differences equation<br/>&nbsp; Standard<br/>&nbsp;&nbsp;&nbsp; D.(LRJSJ LRK LFCYBZ LMJ LRJSR LGZZS)<br/>&nbsp; GMM-type (missing=0, separate instruments for each period unless collapsed)<br/>&nbsp;&nbsp;&nbsp; L(2/3).LLJGG<br/>Instruments for levels equation<br/>&nbsp; Standard<br/>&nbsp;&nbsp;&nbsp; _cons<br/>&nbsp;&nbsp;&nbsp; LRJSJ LRK LFCYBZ LMJ LRJSR LGZZS<br/>&nbsp; GMM-type (missing=0, separate instruments for each period unless collapsed)<br/>&nbsp;&nbsp;&nbsp; DL.LLJGG<br/>------------------------------------------------------------------------------<br/>Arellano-Bond test for AR(1) in first differences: z =&nbsp; -1.44&nbsp; Pr &gt; z =&nbsp; 0.151<br/>Arellano-Bond test for AR(2) in first differences: z =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .&nbsp; Pr &gt; z =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; .<br/>------------------------------------------------------------------------------<br/>Sargan test of overid. restrictions: chi2(1)&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp; 0.18&nbsp; Prob &gt; chi2 =&nbsp; 0.671<br/>&nbsp; (Not robust, but not weakened by many instruments.)<br/>Hansen test of overid. restrictions: chi2(1)&nbsp;&nbsp;&nbsp; =&nbsp;&nbsp; 0.33&nbsp; Prob &gt; chi2 =&nbsp; 0.563<br/>&nbsp; (Robust, but can be weakened by many instruments.)<br/></p>
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