Command Question

[David Thompson]

Colleagues:

What is the opposite of the LAG function?

I want to select a case if the NEXT value of a variable satisfies a condition, rather than the PREVIOUS value of the variable.

Happy Holidays!

David


David W. Thompson, PhD, ABPP
Diplomate in Forensic Psychology
American Board of Professional Psychology

Deputy Director
Walworth Co. Dept. of Health and Human Services
262-741-3232 (voice) 262-741-3217 (fax)

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[MICHAEL J TONER]



Hello,

 

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Michael J. Toner, Ph.D.

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[Lorin Drake]

Thank you for your message. I am on vacation until January 2, 2013.

I will return to work on Wednesday , January 2 and will reply to your email then. 

[David Marso]

LEAD.
See SHIFT VALUES and CREATE in FM.
--

David Thompson wrote

Colleagues:

What is the opposite of the LAG function?

I want to select a case if the NEXT value of a variable satisfies a
condition, rather than the PREVIOUS value of the variable.

Happy Holidays!

David


David W. Thompson, PhD, ABPP
Diplomate in Forensic Psychology
American Board of Professional Psychology

Deputy Director
Walworth Co. Dept. of Health and Human Services
262-741-3232 (voice) 262-741-3217 (fax)

NOTICE OF CONFIDENTIALITY: This e-mail and any files transmitted with it
may contain information that is privileged, confidential, and exempt from
disclosure under applicable laws. This communication is intended for the
sole use of the individual or entity to which it is addressed.
Dissemination, forwarding, printing, or copying of this e-mail and any
files transmitted with it without the consent of the sender is strictly
prohibited. If you have received this e-mail in error, please do not
distribute it. Please notify the sender by e-mail at the address shown and
delete the original message. Thank you.

[Albert-Jan Roskam]

From: David Marso <[hidden email]>
>To: [hidden email]
>Sent: Friday, December 21, 2012 10:34 PM
>Subject: Re: [SPSSX-L] Command Question
>
>LEAD.
>See SHIFT VALUES and CREATE in FM.

The SHIFT VALUES command is newer and more all-round, and it preserves user-missing values (unlike CREATE).
Too bad that both CREATE and SHIFT VALUES require a data pass. I rarely need a lead variable, but because
it doesn't require a data pass I always use LAG, not SHIFT VALUES to create lag variables. But of course SORT is crucial for LAG.

You could sort the data in descending order to create a LEAD with LAG. Danger with LAG: MISSING VALUES calls. Use EXECUTE
if you're not sure! This causes faults, not errors, ergo quite sneaky.

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[Arthur Kramer]

I will be out of my office until January 2, 2013.