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st: mhbounds question


From   "Jenniffer Solorzano Mosquera" <[email protected]>
To   <[email protected]>
Subject   st: mhbounds question
Date   Sat, 19 May 2012 20:33:23 +0200

Hi everyone,
 
I run -mhbounds- command to test for sensitivity my ATT estimator for the binary outcome positive2_EBITDA_mu1. According to my -psmatch2- results, my estimator indicates a positive but not significant effect for the firms treated. Taking a look to the results presented below for -mhbounds-, does it mean that the effect will never be significant no matter how much hidden bias there is? I have to look at the p-critical value with positive sign, right? If a look at the negative critical value that would mean . I am concluding based on The Stata Journal paper 'Sensitivity analysis for average treatment effects', 2007. Thanks for your insights,
 
 -mhbounds positive2_EBITDA_mu1, gamma(1.0 (0.05) 2.0) -
 
Mantel-Haenszel (1959) bounds for variable positive2_EBITDA_mu1
 
Gamma		 Q_mh+	 Q_mh-	 p_mh+	 p_mh-
-------------------------------------------------
    1 	   .544743   .544743   .292965   .292965  
 1.05   	 .426745   .667194   .334783   .252324  
  1.1   	 .312281   .782046   .377413   .217094  
 1.15   	 .202975   .891958   .419577   .186208  
  1.2   	 .098361   .997366   .460823   .159293  
 1.25       -.001963   1.09865   .500783    .13596  
  1.3       -.098352   1.19614   .539174   .115821  
 1.35       -.191118   1.29014   .575784   .098501  
  1.4       -.128199    1.3809   .551004   .083655  
 1.45       -.042557   1.46866   .516973   .070963  
  1.5   	 .040176   1.55362   .483976   .060137  
 1.55   	 .120201   1.63598   .452162   .050921  
  1.6   	 .197698   1.71591   .421641   .043089  
 1.65   	 .272832   1.79355   .392491   .036443  
  1.7   	  .34575   1.86905   .364765   .030808  
 1.75   	 .416588   1.94253    .33849   .026037  
  1.8   	 .485468   2.01411   .313672   .021999  
 1.85   	 .552504   2.08389   .290302   .018585  
  1.9   	 .617797   2.15198   .268354	 .0157  
 1.95   	 .681444   2.21846   .247795   .013262  
    2 	   .743531   2.28341    .22858   .011203  
 
Gamma : odds of differential assignment due to unobserved factors
Q_mh+ : Mantel-Haenszel statistic (assumption: overestimation of treatment effect)
Q_mh- : Mantel-Haenszel statistic (assumption: underestimation of treatment effect)
p_mh+ : significance level (assumption: overestimation of treatment effect)
p_mh- : significance level (assumption: underestimation of treatment effect)
 


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