Date:         Wed, 31 Jan 1996 09:25:26 -0500
Reply-To:     Christopher Zogby <chris@PHOR.COM>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Christopher Zogby <chris@PHOR.COM>
Organization: Pharmaceutical Outcomes Research, Inc.
Subject:      Re: Counting the Months?
Comments: To: chwu@NONAME.AMERICAN.EDU
In-Reply-To:  <4ejkcq$26p@crcnis3.unl.edu>

>I had a difficulty to calculate the number of months from two different
>dates.  The first day indicates the entrance date of a patient and the
>second day is the recovery date.  I want to figure out how long the
>patients stay in hospitals.  Thanks for any response.
 
 
Try the intck function.
 
somevar=intck(interval,from,to);
 
 
Personally I would push for reporting number of days.  The example below
demonstrates why using month as the interval can be troublesome.
 
 
 Cheers,
 
 
 Chris
 
+*******************************************+
| Christopher Zogby                         |
| SAS Programmer/Analyst                    |
| Pharmaceutical Outcomes Research, Inc.    |
| 435 Lawrence Bell Drive                   |
| Williamsville, NY 14221                   |
|   Phone: (716) 633-3463                   |
|     Fax: (716) 633-7404                   |
|       e-mail: chris@phor.com              |
+*******************************************+
 
 
 
 
 
__________________program_____________________________
 
data test;
 
start='01feb95'd;
end='28feb95'd;
 
 
stay=intck('month',start,end);
 
 
put 'number of months patient was hopialized='stay;
 
   run;
 
 
 
_____________________log_______________________________
 
1          data test;
2
3          start='01feb95'd;
4          end='28feb95'd;
5
6
7          stay=intck('month',start,end);
8
9
10         put 'number of months patient was hopialized='stay;
11
12            run;
 
number of months patient was hopialized=0
NOTE: The data set WORK.TEST has 1 observations and 3 variables.