longitudinal data

[Yawen LI]

Hi,
I wonder how i create a new variable to identify the cases which have
complete data (4 waves) or imcomplete data (3, 2, or just 1 wave).
Thanks
Yawen

On Dec 12, 2007 12:16 PM, Richard Ristow <[hidden email]> wrote:

> I've made this suggestion before, but I think it's worth a quick
> repetition now.
>
> Datasets (SPSS 14+) were implemented to operate parallel in many ways
> to SPSS-format saved files on disk; but, deliberately, with certain
> major differences. The most important of these was that GET FILE=...
> and SAVE OUTFILE=... cannot refer to datasets.
>
> A corollary, intended or not, is that XSAVE OUTFILE= cannot refer to
> a dataset, either.
>
> The DATASET commands offer reasonably good equivalents for GET and
> SAVE; but there's no equivalent to XSAVE. If you use XSAVE, you use
> an explicit disk file.
>
> That matters, because you can get some effects with XSAVE that are,
> at best, difficult any other way.
>
> I was reminded of this just now, when I wrote some code that needs
> XSAVE for such a purpose. The code's in my SPSSX-L posting (my
> *second* in this thread),
>
> Date:    Tue, 11 Dec 2007 18:43:13 -0500
> From:    Richard Ristow <[hidden email]>
> Subject: Re: [Many-to-many] Merge Files
> To:      [hidden email]
>
> -Cheers, and SPSS ever onward,
>  Richard
>
> =====================
> To manage your subscription to SPSSX-L, send a message to
> [hidden email] (not to SPSSX-L), with no body text except the
> command. To leave the list, send the command
> SIGNOFF SPSSX-L
> For a list of commands to manage subscriptions, send the command
> INFO REFCARD
>

--
---------------------------------------------------------
Yawen Li
Ph.D candidate
Program Manager/China Program
School of Social Work
University of Southern California
MRF 347, 669 W 34th St. Los Angeles
Tel: [phone]
Email: [hidden email]
http://www-scf.usc.edu/~yawenli/

=====================
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[Melissa Ives]

Yawen
This should work (tested on a dataset with ID values and wave values
only).  Note that it will create the Nrec value for all waves, so by
running the crosstab, you would get the number of cases per wave with
complete data.  Using the wave value for the first record (assuming that
all cases have the first record), you would know the total N of IDs with
complete records.

aggregate outfile=* mode=addvariables/
        break=ID/
        nrec=N.
compute complete=(nrec=4).

cro tab complete by wave.


Melissa

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Yawen LI
Sent: Wednesday, December 12, 2007 7:17 PM
To: [hidden email]
Subject: [SPSSX-L] longitudinal data

Hi,
I wonder how i create a new variable to identify the cases which have
complete data (4 waves) or imcomplete data (3, 2, or just 1 wave).
Thanks
Yawen

On Dec 12, 2007 12:16 PM, Richard Ristow <[hidden email]>
wrote:

> I've made this suggestion before, but I think it's worth a quick
> repetition now.
>
> Datasets (SPSS 14+) were implemented to operate parallel in many ways
> to SPSS-format saved files on disk; but, deliberately, with certain
> major differences. The most important of these was that GET FILE=...
> and SAVE OUTFILE=... cannot refer to datasets.
>
> A corollary, intended or not, is that XSAVE OUTFILE= cannot refer to a

> dataset, either.
>
> The DATASET commands offer reasonably good equivalents for GET and
> SAVE; but there's no equivalent to XSAVE. If you use XSAVE, you use an

> explicit disk file.
>
> That matters, because you can get some effects with XSAVE that are, at

> best, difficult any other way.
>
> I was reminded of this just now, when I wrote some code that needs
> XSAVE for such a purpose. The code's in my SPSSX-L posting (my
> *second* in this thread),
>
> Date:    Tue, 11 Dec 2007 18:43:13 -0500
> From:    Richard Ristow <[hidden email]>
> Subject: Re: [Many-to-many] Merge Files
> To:      [hidden email]
>
> -Cheers, and SPSS ever onward,
>  Richard
>
> =====================
> To manage your subscription to SPSSX-L, send a message to
> [hidden email] (not to SPSSX-L), with no body text except
> the command. To leave the list, send the command SIGNOFF SPSSX-L For a

> list of commands to manage subscriptions, send the command INFO
> REFCARD
>



--
---------------------------------------------------------
Yawen Li
Ph.D candidate
Program Manager/China Program
School of Social Work
University of Southern California
MRF 347, 669 W 34th St. Los Angeles
Tel: [phone]
Email: [hidden email]
http://www-scf.usc.edu/~yawenli/

=====================
To manage your subscription to SPSSX-L, send a message to
[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command SIGNOFF SPSSX-L For a list
of commands to manage subscriptions, send the command INFO REFCARD


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