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Re: st: add up the total stay


From   STATA Dndee <statadndee@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: add up the total stay
Date   Fri, 12 Oct 2007 10:04:15 +0100 (BST)

Hi Arun Rajamohan

Thanks for your reply.
The database is in STATA format and I had better to
should manage everything there. Total number of
records is so high that I would prefer to work with
STATA and not to enter them in Excel. 
ID	DateCame	DateWent	DateWent-DateCame
TotalStayEachVisit
SD101	05-Nov-05	05-Nov-05	0.5	_
SD101	05-Nov-05	11-Nov-05	6	6.5
SD101	28-Apr-05	28-Apr-05	0.5	0.5
SD105	03-Jul-06	03-Jul-06	0.5	0.5
SD105	29-Mar-06	29-Mar-06	0.5	0.1
SD105	13-Jan-06	14-Jan-06	1	_
SD105	10-Jan-06	13-Jan-06	3	4
SD105	24-May-04	25-May-04	1	1
SD217	22-Sep-05	22-Sep-05	0.5	0.5

What I need is calculation of TotalStayEachVisit 
which depends on 1) ID and 2) number of visits. As can
be seen in sample some visitors came only to one
department and some to more than one. I need syntaxes
in STATA.
There is no problem with formatting for dates. 
Regards




--- Arun Rajamohan <arajamoh@uwo.ca> wrote:

> Hi,
> 
> I am not sure what you mean by database. Hopefully
> it is convertible  
> to excel or raw or csv file. I draged the sample
> data from your email  
> and saved it as a raw file. Then I loaded it into
> stata using infix. T
> 
> Your sample dataset is,
> 
> SD101 05-Nov-05 05-Nov-05
> SD101 05-Nov-05 11-Nov-05
> SD101 28-Apr-05 28-Apr-05
> SD105 03-Jul-06 03-Jul-06
> SD105 29-Mar-06 29-Mar-06
> SD105 13-Jan-06 14-Jan-06
> SD105 10-Jan-06 13-Jan-06
> SD105 24-May-04 25-May-04
> SD217 22-Sep-05 22-Sep-05
> 
> I  sucked it up into stata  using infix ...
> 
> infix str id 1-5 str d1 7-8 str m1 10-12 y1 14-15
> str d2 17-18 str m2  
> 20-22 y2 24-25 using ~/desktop/stay.raw, clear
> 
> Now you will have your data in stata looking like
> this...
> 
> id d1 m1 y1 d2 m2 y2
> SD101 05 Nov 05 05 Nov 05
> ...
> 
> Then you may have to add 2000 to the year values.
> 
> [I would appreciate if someone can update me on an
> alternate method.  
> Some of my own datasets have years in the format 96,
> 97, 01, 04 etc.  
> instead of 1996, 1997, 2001, 2004... Stata date
> system does not like  
> years in 2 digit format. Am I right? I've always had
> to use a do file  
> to sort through the years and convert them.]
> 
> 
> Then I recombine the date values using
>   generate came=d1+m1+y1
>   generate went=d2+m2+y2
> to make it look like this,
> 
> 
>       +-------------------------------+
>       |    id        came        went |
>       |-------------------------------|
>    1. | SD101   05Nov2005   05Nov2005 |
>    2. | SD101   05Nov2005   11Nov2005 |
>    3. | SD101   28Apr2005   28Apr2005 |
>    4. | SD105   03Jul2006   03Jul2006 |
>    5. | SD105   29Mar2006   29Mar2006 |
>       |-------------------------------|
>    6. | SD105   13Jan2006   14Jan2006 |
>    7. | SD105   10Jan2006   13Jan2006 |
>    8. | SD105   24May2004   25May2004 |
>       +-------------------------------+
> 
> Now if you format your variables 'came' and 'went'
> into date  
> variables by using,
> gen chkin = date(came,"DMY")
> gen chkout = date(went,"DMY")
>   you should get,
> 
>     
> +------------------------------------------------+
>       |    id        came        went   chkin  
> chkout |
>      
> |------------------------------------------------|
>    1. | SD101   05Nov2005   05Nov2005   16745   
> 16745 |
>    2. | SD101   05Nov2005   11Nov2005   16745   
> 16751 |
>    3. | SD101   28Apr2005   28Apr2005   16554   
> 16554 |
>    4. | SD105   03Jul2006   03Jul2006   16985   
> 16985 |
>    5. | SD105   29Mar2006   29Mar2006   16889   
> 16889 |
>      
> |------------------------------------------------|
>    6. | SD105   13Jan2006   14Jan2006   16814   
> 16815 |
>    7. | SD105   10Jan2006   13Jan2006   16811   
> 16814 |
>    8. | SD105   24May2004   25May2004   16215   
> 16216 |
>      
> +------------------------------------------------+
> 
> Now chkin and chkout are actually number of days
> from 1 Jan 1960.  
> Read more about this at,
> http://www.ats.ucla.edu/stat/stata/modules/dates.htm
> 
> Now using generate, you should be able to subtract
> chkin and chkout  
> and obtain the stay duration.
> 
> To convert a 0 duration to 0.5,
> 
> replace dur=0.5 if dur==0
> 
> Hope it helps
> 
> -A
> 
> On 11-Oct-07, at 3:33 PM, STATA Dndee wrote:
> 
> > Dear all
> > I have a database form visitors stayed in one or
> more
> > departments during each visit.  I want to
> calculate
> > total length of stay during each visit. I need to
> > calculate something like those I calculated
> manually
> > under columns “Date came-Date went” and “total
> stay
> > each visit”. If Date came= Date went, then the
> stay
> > would be 0.5 and not zero.
> > Your help is really appreciated.
> > All the bests
> >
> > ID DateCame DateWent DateCame-DateWent
> > TotalStayEachVisit
> > SD101 05-Nov-05 05-Nov-05 0.5 _
> > SD101 05-Nov-05 11-Nov-05 6 6.5
> > SD101 28-Apr-05 28-Apr-05 0.5 0.5
> > SD105 03-Jul-06 03-Jul-06 0.5 0.5
> > SD105 29-Mar-06 29-Mar-06 0.5 0.1
> > SD105 13-Jan-06 14-Jan-06 1 _
> > SD105 10-Jan-06 13-Jan-06 3 4
> > SD105 24-May-04 25-May-04 1 1
> > SD217 22-Sep-05 22-Sep-05 0.5 0.5
> >
> >
> >
> >
> >      
>
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> 
> Arun Rajamohan
> Department of Biology
> Room 360, Biological & Geological Sciences Building
> 1151 Richmond Street North
> The University of Western Ontario
> London, ON N6A 5B7 CANADA
> 
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