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Re: st: RE: Looping through entries in csv file


From   Gillian.Frost@hsl.gov.uk
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Looping through entries in csv file
Date   Mon, 13 Sep 2010 15:21:50 +0100

Martin,

Thank you for the article.

Unfortunately I cannot merge the two datasets, because I do not have a 
merging variable in the original (names and addresses) dataset.  The 
postcode is not in a separate variable, and can appear in any of the 
address lines.  I therefore need to know the postcode before I can search 
for and identify the postcode in the address.

Furthermore, I cannot think of a way to look through the postcodes from 
the postcode file without reading in the file, and therefore clearing the 
original dataset, which is not what I really want to do.

Many thanks,
Gillian





"Martin Weiss" <martin.weiss1@gmx.de> 
Sent by: owner-statalist@hsphsun2.harvard.edu
13/09/2010 15:06
Please respond to
statalist@hsphsun2.harvard.edu


To
<statalist@hsphsun2.harvard.edu>
cc

Subject
st: RE: Looping through entries in csv file







<>

Generally on looping, you want to see NJC`s
http://www.stata-journal.com/sjpdf.html?articlenum=pr0005

You might be better off -merge-ing the two files, with a judicious choice 
of
the options for -merge- "being of the essence"...


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
Gillian.Frost@hsl.gov.uk
Sent: Montag, 13. September 2010 15:56
To: statalist@hsphsun2.harvard.edu
Subject: st: Looping through entries in csv file

Hello Statalist,

I have a bit of a data management problem, and I was hoping that you would 

be able to help me.

I have a Stata data file containing about 60,000 names and addresses.  The 

addresses are held in 6 different variables, add1-add6, corresponding to 
different lines of the address.  The postcode can appear in any of the 
address variables. 

I also have a separate csv file that contains the postcode districts in 
Great Britain (the section of postcode before the space, e.g. for the 
postcode 'SK17 9JN' the postcode district is 'SK17'), and what county the 
district belongs to (for example, the county for SK17 is "East Midlands"). 

 There are about 2,800 postcode districts in total.

What I want to do is identify the county the individual lives in using the 

postcode of their address.  I thought that I might be able to do this as 
follows:
For each line in the postcode csv file:
1. Identify if the postcode is present in any of the address variables 
using -strpos(s1,s2)-
2. If present, set the county of the individual to be the county 
corresponding to that postcode district from the csv file.

However, I am struggling to find a way to loop through the rows of the csv 

file to enable me to search for each of the postcode districts in the 
addresses.

I would greatly appreciate any help with this, as I am struggling to think 

of a way to do it.  Please let me know if anything needs clarifying.

Many thanks,

Gillian

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