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* Advanced Applied Econometrics
* Jakub Muck 
* Meeting 9
* Panel data

* 1. Basic data processing with panel data 
webuse grunfeld 

xtset company year 

xtdescribe 

* 2. Pooled regression 
reg invest kstock mvalue 
estimates store pooled

* + clustered se 
reg invest kstock mvalue, vce(cluster company)  
estimates store pooled_cluster 

* 3. FE 
xtreg invest kstock mvalue, fe 
estimates store fe 

* 4. RE

xtreg invest kstock mvalue
estimates store re 
xttest0

* Summary 
estimates table pooled* fe re , b se p 
hausman fe re 

* 5. Hausman-Taylor exmample 
 clear all
 webuse psidextract

 * 5.1 RE 
xtreg lwage wks south smsa ms exp exp2 occ ind union fem blk ed, re 
estimates store re 
 
 *5.2 HT estimator  
xthtaylor lwage wks south smsa ms exp exp2 occ ind union fem blk ed, endog( ed) 
estimates store ht 

estimates table  re ht, b se p  
hausman ht re