Date:         Fri, 9 Sep 2005 09:59:24 -0400
Reply-To:     Martin Sherman <MSherman@loyola.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Martin Sherman <MSherman@loyola.edu>
Subject:      Explaining output of a do if with missing values
Content-Type: text/plain; charset=US-ASCII

Dear list, I have the following syntax program along with the output.
What I don't understand
is why if Race eq 3  and sex is missing then racesex eq 5 but when sex
eq 1 and race is missing
then racesex eq missing. What am I missing. thanks,  martin sherman

data list free / race sex.
begin data
1 1
.  1
1 2
1 2
2 1
2 1
2 .
2 2
3 1
3 1
3 2
3 2
.  .
3 .
4 1
4 2
4 2
5 1
.  1
5 2
end data.
do if (race eq 1 and sex eq 1).
compute racesex=1.
else if (race eq 1 and sex eq 2).
compute racesex=2.
else if (race eq 2 and sex eq 1).
compute racesex=3.
else if (race eq 2 and sex eq 2).
compute racesex=4.
else.
compute racesex=5.
end if.
list race sex racesex.
    1.00            1.00            1.00
.           1.00        .
    1.00            2.00            2.00
    1.00            2.00            2.00
    2.00            1.00            3.00
    2.00            1.00            3.00
    2.00        .       .
    2.00            2.00            4.00
    3.00            1.00            5.00
    3.00            1.00            5.00
    3.00            2.00            5.00
    3.00            2.00            5.00
.       .       .
    3.00        .           5.00
    4.00            1.00            5.00
    4.00            2.00            5.00
    4.00            2.00            5.00
    5.00            1.00            5.00
.           1.00        .
    5.00            2.00            5.00