understand transformations

[Moon Kid]

I thinkt "transformations" are a concept that I don't understand right.
Maybe you can help me to understand the conecpt and change my way of
thinking how to handle data with SPSS. ;)

I have 6 oberservations. And I want to do this by "Syntax" (means a
Script with SPSS-own-language):

COMPUTE v04von = TIME.HMS(v04vh,v04vm,0).

Nothing happens. Just a "outstanding transformations" message appear
and I have to click (oh my good!) "run transformations" in a menu.

The nice thing is that I don't have to code a construct to iterate over
all observations. How can I execute the transformation by script? I
don't want to click.

And just for the future: How could I do such an operation over a
selection of the observations. Maybe just the observertions ver vX=7.

Thank you very much for your help.
btw: You will be appear in the thank-you-area of my work. ;)

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[Bruce Weaver]

Add an EXECUTE command, or a procedure that causes a data pass.  E.g.,

COMPUTE v04von = TIME.HMS(v04vh,v04vm,0).
EXECUTE.

or...

COMPUTE v04von = TIME.HMS(v04vh,v04vm,0).
DESCRIPTIVES v04von.

Moon Kid wrote

I thinkt "transformations" are a concept that I don't understand right.
Maybe you can help me to understand the conecpt and change my way of
thinking how to handle data with SPSS. ;)

I have 6 oberservations. And I want to do this by "Syntax" (means a
Script with SPSS-own-language):

COMPUTE v04von = TIME.HMS(v04vh,v04vm,0).

Nothing happens. Just a "outstanding transformations" message appear
and I have to click (oh my good!) "run transformations" in a menu.

The nice thing is that I don't have to code a construct to iterate over
all observations. How can I execute the transformation by script? I
don't want to click.

And just for the future: How could I do such an operation over a
selection of the observations. Maybe just the observertions ver vX=7.

Thank you very much for your help.
btw: You will be appear in the thank-you-area of my work. ;)

=====================
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[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
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[Jon K Peck]

Statistics does lazy evaluation of transformations.  That means that they are executed the next time the data has to be passed such as with SAVE or a statistical procedure.  This saves a usually unnecessary data pass just for the transformations.  However, if you want to see the results in the Data Editor right away, you can include an EXECUTE command at the end of your transformation block.

As for conditionally executing transformations, see DO IF.


Jon Peck (no "h") aka Kim
Senior Software Engineer, IBM
[hidden email]
phone: [phone]




From:        Moon Kid <[hidden email]>
To:        [hidden email],
Date:        03/29/2014 03:21 AM
Subject:        [SPSSX-L] understand transformations
Sent by:        "SPSSX(r) Discussion" <[hidden email]>

---

I thinkt "transformations" are a concept that I don't understand right.
Maybe you can help me to understand the conecpt and change my way of
thinking how to handle data with SPSS. ;)

I have 6 oberservations. And I want to do this by "Syntax" (means a
Script with SPSS-own-language):

COMPUTE v04von = TIME.HMS(v04vh,v04vm,0).

Nothing happens. Just a "outstanding transformations" message appear
and I have to click (oh my good!) "run transformations" in a menu.

The nice thing is that I don't have to code a construct to iterate over
all observations. How can I execute the transformation by script? I
don't want to click.

And just for the future: How could I do such an operation over a
selection of the observations. Maybe just the observertions ver vX=7.

Thank you very much for your help.
btw: You will be appear in the thank-you-area of my work. ;)

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command. To leave the list, send the command
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[David Marso]

BUT!
Please delete any EXECUTE statements from all production code (Except in very special circumstances)!
eg. Ts involving SELECT after LAG or references to $CASENUM.

[Moon Kid]

On 2014-03-29 05:52 David Marso <[hidden email]> wrote:
> BUT!
> Please delete any EXECUTE statements from all production code (Except
> in very special circumstances)!
> eg. Ts involving SELECT after LAG or references to $CASENUM.

Can you explain why?

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[David Marso]

Can you indicate a reason why you wouldn't?
RTFM on the EXECUTE command, $CASENUM and LAG.
Briefly: EXECUTE passes the data.  You really don't want that if you have a large file.
$CASENUM is dynamic. SELECT IF based on $CASENUM can/will yield incorrect results if not done carefully.
LAG similar in that regard.
I will leave it to you to experiment and perhaps achieve a glimmer of enlightenment in these regards.
Have you bothered yet to read the Universals section of the FM as several have previously suggested?

Moon Kid wrote

On 2014-03-29 05:52 David Marso <[hidden email]> wrote:
> BUT!
> Please delete any EXECUTE statements from all production code (Except
> in very special circumstances)!
> eg. Ts involving SELECT after LAG or references to $CASENUM.

Can you explain why?

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