Re: st: About difference in differences estimation

[Ronnie Babigumira <rb.glists@gmail.com>]

Lynn,

There seems to be a fundamental misunderstanding here about user written commands. Please read this http://stata.com/capabilities/user-written-commands/

Ronnie

-- 
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On Monday, September 17, 2012 at 12:38 PM, Lynn Lee wrote:

> The Stata11 was installed in my computer by my friend, a university staff
> who is in charge of all campus-use softwares. And this installation was not
> free. Per your question, I really do not know why I can get "diff" command
> by typing help. It may be installed in my computer at the same time when my
> friend installed the software. I searched website about how to run DID in
> Stata, and I learned that command -diff- can help. That is all the sources I
> got about DID. I am not sure your question about where I got this -diff-. I
> am not expert in computer science, and when I type "help diff", Stata gives
> me the instruction of DID. So, this command should be installed at the same
> time my friend installed Stata11 for me. 
> 
> I have no idea about user-written command and Stata command. Is that mean
> user-written command are not allowed to be used by researchers? I was not
> informed about this when I purchased usage of this software. So sorry about
> this. 
> 
> Best Regards,
> Lynn Lee
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu (mailto:owner-statalist@hsphsun2.harvard.edu)
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis
> Sent: Monday, September 17, 2012 4:12 PM
> To: statalist@hsphsun2.harvard.edu (mailto:statalist@hsphsun2.harvard.edu)
> Subject: Re: st: About difference in differences estimation
> 
> On Mon, Sep 17, 2012 at 9:21 AM, Lynn Lee wrote:
> > I got this "diff" command in Stata11 by typing "help diff". The syntax is
> 
> 
> "
> > diff outcome_var [if] [in] [weight] ,[ options]".
> 
> 
> 
> That cannot be true: -help- only knows only about things that are on your
> computer. User written software is not provided to you by StataCorp (but by
> users, hence the name), so when you install Stata, you are not installing
> any user written software. So -help- cannot install user written software.
> You must have done so separately.
> 
> -- Maarten
> 
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
> 
> http://www.maartenbuis.nl
> ---------------------------------
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