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st: tobit and xtreg pls help

From   somsupa Nopprach <>
Subject   st: tobit and xtreg pls help
Date   Thu, 14 May 2009 01:17:43 -0700 (PDT)

Dear Statalisters,

 Any help or suggest will be very appreciated. 
   my dependent variable (y)is an index , whose value range from -2 to 2.
my data is panel data and i set industry and country as my id. and year as t. i already set tsset.

due to the limit of my y variable, i select to use xttobit. and i interpreted the effect of my Xs on y by using mfx compute, predict(e(-2,2))

I have five questions

1. my y variable left-side skewed distribution. i have read that it should be normal distribution to allow Tobit efficient. so , how i should manage with this problem. I tried vce option, but when i use vce option the error below is shown.
"xtintreg_d2 failed to compute scores required by the robust option
what i should do to deal with this error?
2. because there is no left and right cencored obs (zero observation) , I wonder that is it still necessary for me to use xttobit. some of my equations have only two censor observations but most of them are zero.
3.-estout- to show the mfx coeff. is it right that i use b or i should write margin in-estout-

3.  in my model i also add country dummy and year variable to detrend, is it still appropriate to use random-effects model?
4. regarding xtreg command, if i use re option(random model)and i want the r2 of random model to show in estout what command i should use?

Could you suggest which model i should to use and help me solves the problems above.

thank you so much in advance,


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