Date: Wed, 28 Mar 2012 06:27:58 -0700
Reply-To: Bruce Weaver <bruce.weaver@hotmail.com>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Bruce Weaver <bruce.weaver@hotmail.com>
Subject: Re: Summing a variable.
In-Reply-To: <1332939721601-5600405.post@n5.nabble.com>
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I was thinking of CREATE with the CSUM function, but David's solution is a
lot neater. Note that it is the use of SUM that makes it work. I.e., the
following would not work, because LAG(GOALSUM) = SYSMIS on the first row.
COMPUTE GOALSUM=GOAL + LAG(GOALSUM).
Here's a more complete example of the difference.
data list list (",") / goal minutes.
begin data
1, 3
, 4
, 5
1, 6
1, 7
, 8
1, 9
1, 10
1, 11
, 12
, 13
, 14
, 15
, 16
1, 17
1, 18
, 19
1, 20
, 21
1, 22
end data.
COMPUTE GOALSUM1=SUM(GOAL,LAG(GOALSUM1)). /* David's method.
COMPUTE GOALSUM2= GOAL + LAG(GOALSUM2). /* Simple addition rather than
SUM().
COMPUTE LagGS1 = LAG(goalsum1).
COMPUTE LagGS2 = LAG(goalsum2).
FORMATS all(f5.0).
LIST.
OUTPUT:
goal minutes GOALSUM1 GOALSUM2 LagGS1 LagGS2
1 3 1 . . .
. 4 1 . 1 .
. 5 1 . 1 .
1 6 2 . 1 .
1 7 3 . 2 .
. 8 3 . 3 .
1 9 4 . 3 .
1 10 5 . 4 .
1 11 6 . 5 .
. 12 6 . 6 .
. 13 6 . 6 .
. 14 6 . 6 .
. 15 6 . 6 .
. 16 6 . 6 .
1 17 7 . 6 .
1 18 8 . 7 .
. 19 8 . 8 .
1 20 9 . 8 .
. 21 9 . 9 .
1 22 10 . 9 .
Number of cases read: 20 Number of cases listed: 20
David Marso wrote
>
> Once again, LAG is your friend.
> COMPUTE GOALSUM=SUM(GOAL,LAG(GOALSUM)).
>
>
> drfg2008 wrote
>>
>> SPSS 20 Windows
>>
>> I have the variable "goals", which measures the goals at each time (see
>> below: one goal at each time) and I just want the variable "goals" to be
>> added up (like in the variable "GoalSum").
>>
>> Goal GoalSum Minutes
>>
>> 1 1 3
>> . 1 4
>> . 1 5
>> 1 2 6
>> 1 3 7
>> . 3 8
>> 1 4 9
>> 1 5 10
>> 1 6 11
>> . 6 12
>> . 6 13
>> . 6 14
>> . 6 15
>> . 6 16
>> 1 7 17
>> 1 8 18
>> . 8 19
>> 1 9 20
>> . 9 21
>> 1 10 22
>>
>>
>> Thanks for help.
>>
>> Frank
>>
>
-----
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/
"When all else fails, RTFM."
NOTE: My Hotmail account is not monitored regularly.
To send me an e-mail, please use the address shown above.
--
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