|Date: ||Tue, 13 May 2008 14:40:43 -0400|
|Reply-To: ||Richard Ristow <email@example.com>|
|Sender: ||"SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>|
|From: ||Richard Ristow <firstname.lastname@example.org>|
|Subject: ||Re: missing values in do if|
|Content-Type: ||text/plain; charset="us-ascii"; format=flowed|
I wrote too quickly. What I wrote was right, but not enough. At 01:19
PM5/12/2008, Keval Khichadia wrote:
>[In the following syntax] I get the correct value (1) for LowIncome
>but there are several cases when there are values for num_in_family
>and Fisap_Income where the value should be 0 but I am getting $sysmis
The code I sent,
else if SYSMIS(num_in_family) | SYSMIS(Fisap_Income).
compute LowIncome = $sysmis.
compute LowIncome = 0.
won't be reached if either variable is missing, because the first test,
>do if num_in_family = 1 & Fisap_Income <= 19600.
will return 'missing' in that case, and the rest of the DO IF will be skipped.
You need something like this, checking for missing values at the
*beginning* of the DO IF:
MISSING VALUES LowIncome(9).
DO IF SYSMIS(num_in_family) | SYSMIS(Fisap_Income).
. compute LowIncome = 9.
else if num_in_family = 2 & Fisap_Income <= 26400.
. compute LowIncome = 1.
. compute LowIncome = 0.
Note that 9 is defined as a user-missing value for "LowIncome", and
that, not SYSMIS, is the value it's given if you have missing data.
Art Kendall's right about this one.
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