我用的xtbond 和xtdpdsys进行GMM估计，之后出来的结果没有hansen和AR的检验结果，请问如何做啊？
另外xtbond2是用来做系统GMM还是差分GMM的啊？我查了网上的资料，后面的东东我看不懂，不知道如何具体操作，又代表了什么含义。
以上问题还请达人指教，我万分感谢！第一位正确回答者如有在本站下载资料缺乏money之类情形，我一定尽力帮忙。

附上我用xtdpdsys命令做的结果。PI是被解释变量，全部取了对数。
xtdpdsys logpi loggdp logpe logppi logwage logcor1
System dynamic panel-data estimation Number of obs = 248
Group variable: region Number of groups = 31
Time variable: year
Obs per group: min = 8
avg = 8
max = 8
Number of instruments = 41 Wald chi2(6) = 3353.06
Prob > chi2 = 0.0000
One-step results
------------------------------------------------------------------------------
logpi | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
logpi |
L1. | .6937577 .0529812 13.09 0.000 .5899164 .797599
|
loggdp | .2633283 .0789808 3.33 0.001 .1085288 .4181277
logpe | .1075993 .0447046 2.41 0.016 .0199799 .1952187
logppi | 1.044533 .2818636 3.71 0.000 .492091 1.596976
logwage |-.7823356 .3633763 -2.15 0.031 -1.49454 -.0701312
logcor1 |-.1895719 .0606002 -3.13 0.002 -.3083462 -.0707976
_cons | -1.61579 2.12383 -0.76 0.447 -5.77842 2.546841
------------------------------------------------------------------------------
Instruments for differenced equation
GMM-type: L(2/.).logpi
Standard: D.loggdp D.logpe D.logppi D.logwage D.logcor1
Instruments for level equation
GMM-type: LD.logpi
Standard: _cons