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st: RE: long to wide conversion


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: long to wide conversion
Date   Thu, 7 Oct 2010 12:12:58 +0100

To -reshape- this to wide, you need to create an extra identifier: 

bysort id (collect_date) : gen order_no = _n 

Then 

reshape wide collect_date order_type drug_code drug_result, i(id) j(order_no) 

That said, this strikes me as a bad idea for most Stata purposes. Some things are easier with a  wide structure but most things are easier otherwise. 

There is much more discussion in 

SJ-9-1  pr0046  . . . . . . . . . . . . . . . . . . .  Speaking Stata: Rowwise
        (help rowsort, rowranks if installed) . . . . . . . . . . .  N. J. Cox
        Q1/09   SJ 9(1):137--157
        shows how to exploit functions, egen functions, and Mata
        for working rowwise; rowsort and rowranks are introduced

Nick 
n.j.cox@durham.ac.uk 

King, Carina

I have a data set in long form and i want to convert it to wide. I have tried the 'reshape' command (using various combinations of variables) but it won't work. The problem is, there aren't any unique j values for the i's. 

The variables I want to be sorted on are the id, collect_date and order_type. The for it to read across for drug_code and drug_result (They are all string variables). Below as an example of how my data is set up. 

Id       collect_date     order_type        drug_code     drug_result

34       03aug2010        CFS                   Amp            SS
34       03aug2010        CFS                   Oxy            0.1-SS
34       10aug2010        CFS                   Methc          R
57       05mar2008        Urine                 Amox           R
57       05mar2008        Urine                 Amik           0.001-SS-HIDE
87       07sep2009        Blood                 Oxy            HIDE
62       12oct2007         Urine                Vanc           0.063-SS
62       12oct2007         Urine                Methc          0.063-SS
62       12oct2007         Urine                Vanc           R-HIDE    
62       12oct2007         Blood                Amp            SS


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