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Re: st: superposed rolled windows


From   "irodriguez" <irodriguez@utdt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: superposed rolled windows
Date   Tue, 27 Jun 2006 13:52:11 -0300

In the data editor windows all the variables except yeaar are in red
this mean that are string?
how can I convert the profit variable to string with encode or with destring
i`ve tried with 
destring profit, replace 
but it`s still red
 

-----Original Message-----
From: "Michael S. Hanson" <mshanson@mac.com>
To: statalist@hsphsun2.harvard.edu
Date: Tue, 27 Jun 2006 12:41:33 -0400
Subject: Re: st: superposed rolled windows

> On Jun 27, 2006, at 12:05 PM, irodriguez wrote:
> 
> > Michael, in your command:
> >    tsset Firms Years     // Declare data as a panel
> >    forval i = 1/3 {
> >          local j = `i'-1
> >         gen Profit`i' = F`j'.Profit
> >     }
> >    drop if missing(Profit3)
> >
> > what is the significate of 1/3, because in the reality i need to make
> > superposed rolled windows for 5 years and I want to know if I have  
> > to change the command and consider 1/5
> 
>    Yes, the "3" in "1/3" represents the number of years you specified  
> in your earlier message.  You could try the following:
> 
> 
> tsset Firms Years     // Declare data as a panel
> local m 5             // Maximum number of years for "rolled windows"
> forval i = 1/`m' {
>      local j = `i'-1
>      gen Profit`i' = F`j'.Profit
> }
> drop if missing(Profit`m')
> 
> 
>    Notice that in addition to the -local- command, the -forval- and - 
> drop- commands have changed vis-a-vis the quoted example.  If you  
> decide to go back to a 3-year "superposed rolled windows" (in  
> increase it to, say, 6), you can just change the "5" in the second  
> line to the desired number of years, and the rest of your code will  
> run as intended.  (At least as far as I understand what you intend.)
> 
> 
> On Jun 27, 2006, at 12:14 PM, irodriguez wrote:
> 
> > When I try
> > . tsset empresa ao
> > stata say
> > varlist:  empresa:  string variable not allowed
> > I have tried with destring command but I don`t know why the data  
> > are still
> > string
> 
>    Are you sure the data are (now) numeric?  -desc empresa- will tell  
> you if they are int(egers) or str(ings).  Without knowing more about  
> your data, it is difficult to know if what you really want is - 
> encode- rather than -destring-.
> 
>    More generally, I encourage you to follow Nick Cox's dictum[*] of  
> explaining exactly what you want to do, and listing the exact  
> commands you have typed in your attempt to do so.  An actual (but  
> brief) extract of your data can be helpful to those providing  
> assistance as well.  HTH.
> 
>                                          -- Mike
> 
> 
> [*] My attribution of this premise to Nick is (merely) empirical, as  
> I have often observed him making similar comments in similar  
> circumstances.  See the Statalist FAQ at <http://www.stata.com/ 
> support/faqs/res/statalist.html> for a more expansive discussion of  
> this issue.
> *
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