Hello,
I am running a Iterated GMM model like this:

Code:
webuse abdata
xtdpdgmm L(0/1).n l.w l.k, model(diff) gmm(n w, l(2 4)) iv(l.k) small noconstant vce(r) igmm igmmiterate(100)
* soring relevant information
estadd scalar Groups = e(N_g)
estadd scalar Instruments = e(zrank)  
estadd scalar iter = e(ic)  
eststo igmm
I would like to add to my estimates the results from a few post estimation commands. In particular, I would like to add results for the serial correlation and overidentification test.
I know how to run the commands but I am having troubles add the results to the stored estimates.
The post estimation command are the following

Code:
estat serial, ar(1/3)
estat overid
I would like to include in my estimates the results for autocorrelation of order 2 and for the Hansen J statistic. Ultimately I would like to be able to display a table using the esttab command, but I do not know how to add results from estat serial and estat overid. Results should look something like this

Code:
esttab igmm, s(N Instruments Groups iter ar2 hj)

----------------------------
                      (1)   
                        n   
----------------------------
L.n                 1.858***
                   (9.81)   

L.w                 0.607   
                   (1.96)   

L.k                -0.724***
                  (-4.20)   
----------------------------
N                     891   
Instruments            37   
Groups                140   
iter                    0   
ar2                     0.0182    
hj                      0.0027
----------------------------
t statistics in parentheses
* p<0.05, ** p<0.01, *** p<0.001

Thanks a lot in advance for your help