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st: Sorting string variable based on a numeric variable


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Sorting string variable based on a numeric variable
Date   Wed, 10 Oct 2007 21:45:08 +0200

Marta wrote:
 
...
"Cars" is a string variable under which I have 
different car models. The second variable is "Price". 
I have different prices for the same car model. 
What I need to do is to sort ascendingly the prices 
of each car model, because I only want to keep the 
lowest price of each car model. I tried to use the 
commands -sort- and -by-, but I didn't succeed. 
 
Suppose my dataset is 
 
CAR                                PRICE
Renault Clio                      10000
Renault Clio                      11000
Renault Clio                      10500
Audi A4                            30000
Audi A4                            27000 
Audi A4                            28000
 
First I want to arrange the dat in this way
 
CAR                                PRICE
Renault Clio                      10000
Renault Clio                      10500
Renault Clio                      11000
Audi A4                            27000
Audi A4                            28000 
Audi A4                            30000
 
and then I only want to keep the first observation of each category
 
CAR                                PRICE
Renault Clio                      10000
Audi A4                            27000
 

--------------------------------------------
 
   sort CAR PRICE
   by CAR: keep if _n==1
 
Hope this helps
Svend

________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       sj@soci.au.dk 
_________________________________________________________ 

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