Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: Please Help How to Summarize Data - Revised Version


From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: Please Help How to Summarize Data - Revised Version
Date   Mon, 1 Jan 2007 12:06:47 +0000 (GMT)

--- Maarten buis <[email protected]> wrote:
> In order to get what you want it is sometimes easier to temorarily
> loose parts of your data, for instance the duplications of firms in
> your dataset. You can do that temporarily with the command -preserve-
> and -restore-. This is what I have done the example below. 

hmmm, I actually forgot to put in the line -preserve-. The example
should be:

*-------------- begin example ---------------
/* getting the data in Stata */
clear
input str1 Firm     Stage         Investors   str9 Date               
  A           1                      1            " 1 Oct 96"
  A           2                      2            " 1 Apr 97"
  A           2                      2            " 1 Apr 97"
  B           1                      2            "28 Mar 01"
  B           1                      2            "28 Mar 01"
  C           1                      1            " 1 Feb 01"
  C           2                      1            " 1 Feb 02"
  C           3                      1            " 1 Feb 03"
  D           1                      3            "15 May 95"
  D           1                      3            "15 May 95"
  D           1                      3            "15 May 95"
end

gen stdate = date(Date, "dmy", 2040)
format stdate %td

/* duplicates are unnecesary and complicating for this task */
/* so I loose them, but I use -preserve- so I can -restore- */
/* the data when I am done */

preserve

sort Firm Stage

by Firm Stage: keep if _n==1


/* table of count syndicated by stage */

gen syndicated = Investors >=2
table Stage, c(sum syndicated) row

/* duration till syndicated */
gen firstsyn = stdate if syndicated == 1
format firstsyn %td
collapse (min) stdate firstsyn, by(Firm)
gen time = firstsyn - stdate
list

restore
*--------------- end example ----------------


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

Send instant messages to your online friends http://uk.messenger.yahoo.com 
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index