SPSSX Discussion

Re: Difference Between Longitudinal Data and Panel Data

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Hans Chen

Re: Difference Between Longitudinal Data and Panel Data

Dear Listers:

I just wonder whether there is any difference between Longitudinal Data and
Panel Data? Thanks for your help!

--
Hans Chen
Canada

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zstatman

Re: Difference Between Longitudinal Data and Panel Data

As the name implies, Longitudinal Data are generally time oriented in that
each set or period is based on a point in time after the one preceding it.
Usually there is a base (baseline) point then several "survey insertions"
say monthly, quarterly,.... Panel Data, on the other hand is simply a
database of persons who are interested n participation whether that be a
survey, a taste test, etc.

Short point: Very different

WMB
Statistical Services

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On 10/8/2008 3:39:53 PM, Hans Chen ([hidden email]) wrote:

> Dear Listers:
>
> I just wonder whether there is any difference between Longitudinal Data
> and
> Panel Data? Thanks for your help!
>
> --
> Hans Chen
> Canada
>
> =====================
> 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
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Will
Statistical Services

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Swank, Paul R

Re: Difference Between Longitudinal Data and Panel Data

Actually, a panel study is a type of longitudinal research. Longitudinal
studies are generally trend studies, following a particular population
by taking samples over time where the population changes over time,
cohort studies, where multiple samples are taken but the population
stays the same, and panel studies, where one sample is followed over
time.

Paul R. Swank, Ph.D
Professor and Director of Research
Children's Learning Institute
University of Texas Health Science Center
Houston, TX 77038

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Statmanz
Sent: Wednesday, October 08, 2008 2:58 PM
To: [hidden email]
Subject: Re: Difference Between Longitudinal Data and Panel Data

As the name implies, Longitudinal Data are generally time oriented in
that
each set or period is based on a point in time after the one preceding
it.
Usually there is a base (baseline) point then several "survey
insertions"
say monthly, quarterly,.... Panel Data, on the other hand is simply a
database of persons who are interested n participation whether that be a
survey, a taste test, etc.

Short point: Very different

WMB
Statistical Services

============
mailto: [hidden email]
http:\\home.earthlink.net\~info.statman
============

On 10/8/2008 3:39:53 PM, Hans Chen ([hidden email]) wrote:
> Dear Listers:
>
> I just wonder whether there is any difference between Longitudinal
Data

> and
> Panel Data? Thanks for your help!
>
> --
> Hans Chen
> Canada
>
> =====================
> To manage your subscription to SPSSX-L, send a message to
> [hidden email] (not to SPSSX-L), with no body text except

Guerrero, Rodrigo

Re: Difference Between Longitudinal Data and Panel Data

In reply to this post by zstatman

You could go back to the same panel again and again and not interview
the same people. In a longitudinal study, the same respondents have to
be involved with some replacement.

RG

Rodrigo A. Guerrero | Director Of Marketing Research and Analysis | The
Scooter Store | 830.627.4317

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Statmanz
Sent: Wednesday, October 08, 2008 2:58 PM
To: [hidden email]
Subject: Re: Difference Between Longitudinal Data and Panel Data

As the name implies, Longitudinal Data are generally time oriented in
that
each set or period is based on a point in time after the one preceding
it.
Usually there is a base (baseline) point then several "survey
insertions"
say monthly, quarterly,.... Panel Data, on the other hand is simply a
database of persons who are interested n participation whether that be a
survey, a taste test, etc.

Short point: Very different

WMB
Statistical Services

============
mailto: [hidden email]
http:\\home.earthlink.net\~info.statman
============

On 10/8/2008 3:39:53 PM, Hans Chen ([hidden email]) wrote:
> Dear Listers:
>
> I just wonder whether there is any difference between Longitudinal
Data

Swank, Paul R

Re: Difference Between Longitudinal Data and Panel Data

Not according to Krawthwohl (1993) Methods of Educational and Social
Science Research. Also Borg and Gall but I don't have that one my shelf
here.

Paul R. Swank, Ph.D
Professor and Director of Research
Children's Learning Institute
University of Texas Health Science Center
Houston, TX 77038

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Guerrero, Rodrigo
Sent: Wednesday, October 08, 2008 3:13 PM
To: [hidden email]
Subject: Re: Difference Between Longitudinal Data and Panel Data

You could go back to the same panel again and again and not interview
the same people. In a longitudinal study, the same respondents have to
be involved with some replacement.

RG

Rodrigo A. Guerrero | Director Of Marketing Research and Analysis | The
Scooter Store | 830.627.4317

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Statmanz
Sent: Wednesday, October 08, 2008 2:58 PM
To: [hidden email]
Subject: Re: Difference Between Longitudinal Data and Panel Data

As the name implies, Longitudinal Data are generally time oriented in
that
each set or period is based on a point in time after the one preceding
it.
Usually there is a base (baseline) point then several "survey
insertions"
say monthly, quarterly,.... Panel Data, on the other hand is simply a
database of persons who are interested n participation whether that be a
survey, a taste test, etc.

Short point: Very different

WMB
Statistical Services

============
mailto: [hidden email]
http:\\home.earthlink.net\~info.statman
============

On 10/8/2008 3:39:53 PM, Hans Chen ([hidden email]) wrote:
> Dear Listers:
>
> I just wonder whether there is any difference between Longitudinal
Data

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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dakalahar@netzero.net

Re: Difference Between Longitudinal Data and Panel Data

In reply to this post by Hans Chen

Market researchers commonly use members of consumer "panels" as respondents for various research. These panels have come into great prominence recently as internet regulations (can-spam) have prevented the solicitation of people via email who haven't previously expressed an interest in being contacted for research.

As I recently returned to market research from a job primarily focused on secondary data analysis, I ran into similar confusion. For me panel meant a research design not a source of respondents for a survey. But its all clear to me now.

thanks,
Derek

-- "Swank, Paul R" <[hidden email]> wrote:
Not according to Krawthwohl (1993) Methods of Educational and Social
Science Research. Also Borg and Gall but I don't have that one my shelf
here.

Paul R. Swank, Ph.D
Professor and Director of Research
Children's Learning Institute
University of Texas Health Science Center
Houston, TX 77038

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Guerrero, Rodrigo
Sent: Wednesday, October 08, 2008 3:13 PM
To: [hidden email]
Subject: Re: Difference Between Longitudinal Data and Panel Data

You could go back to the same panel again and again and not interview
the same people. In a longitudinal study, the same respondents have to
be involved with some replacement.

RG

Rodrigo A. Guerrero | Director Of Marketing Research and Analysis | The
Scooter Store | 830.627.4317

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Statmanz
Sent: Wednesday, October 08, 2008 2:58 PM
To: [hidden email]
Subject: Re: Difference Between Longitudinal Data and Panel Data

As the name implies, Longitudinal Data are generally time oriented in
that
each set or period is based on a point in time after the one preceding
it.
Usually there is a base (baseline) point then several "survey
insertions"
say monthly, quarterly,.... Panel Data, on the other hand is simply a
database of persons who are interested n participation whether that be a
survey, a taste test, etc.

Short point: Very different

WMB
Statistical Services

============
mailto: [hidden email]
http:\\home.earthlink.net\~info.statman
============

On 10/8/2008 3:39:53 PM, Hans Chen ([hidden email]) wrote:
> Dear Listers:
>
> I just wonder whether there is any difference between Longitudinal
Data

David Greenberg

Re: Difference Between Longitudinal Data and Panel Data

In reply to this post by Hans Chen

Usages vary slightly, as some of the responses already posted demonstrated. As I and many others use the term "longitudinal", it encompasses any study in which there are observations on the same object or on multiple objects at multiple points in time. This could encompass time series analyses, event history analyses, and panel data (observations on multiple objects at multiple times) is a particular time of longitudinal data. David Greenberg, Sociology Department, New York University

----- Original Message -----
From: Hans Chen <[hidden email]>
Date: Wednesday, October 8, 2008 3:48 pm
Subject: Re: Difference Between Longitudinal Data and Panel Data
To: [hidden email]

> Dear Listers:
>
> I just wonder whether there is any difference between Longitudinal
> Data and
> Panel Data? Thanks for your help!
>
> --
> Hans Chen
> Canada
>
> =====================
> 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

Hortensia Carrillo

Equamax

In reply to this post by dakalahar@netzero.net

How can I get a Rotated Component MAtrix in Equamax, if the program tells me that failed in converged in 25 interactions. If I put more or less interactions? Or that means that this is not an adequated way of analyses the data?
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Albert-Jan Roskam

weighting pregnancy duration

Hi,

I have a dataset with a pregancy duration variable (weeks). We know that early pregancy durations are registered incompletely. We can assume that (at least for singletons) the distribution of duration is 'negatively skewed normal'; that is, a fairly long tail of early durations, the bulk of the pregancies is of normal duration, and almost no very long durations. How would I go about if I wanted to create a weight that restores this assumed distribution? I read Hector Maletta's paper on spsstools.net already, but it doesn't deal with cases like this.

Eventually, we also need to equalise the proportions of other variables (postal code, for example) to the proportions of a reference dataset. However, the reference dataset does not contain a pregancy duration var.

Cheers!!
Albert-Jan

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Spousta Jan

Re: weighting pregnancy duration

Hi Albert-Jan,

1) Construct a table with expected percentages, based on your knowledge about the correct distribution, and add the observed percentages in your file, eg.
Duration expected observed
(weeks) (%)
1 0.2 0.1
2 0.5 0.25
... ... ...
45 0.3 0.4
46 0.1 0.15

2) Run:
RANK VARIABLES=observed /N into ncases /PRINT=NO.
compute wgt = expected / observed.
WEIGHT BY wgt .
RANK VARIABLES=observed /N into nweighted /PRINT=NO.
compute wgt = wgt * ncases / nweighted .
exe.

And you have the weights for weeks in the variable wgt now.

3) Add the variable wgt to the file (eg. using MATCH FILES) and use WEIGHT BY wgt .

If you wish to adjust weights also for another variables, use so-called raking (perhaps you'll find it in the archives of the discussion or on Raynald's pages).

HTH

Jan

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Albert-jan Roskam
Sent: Thursday, October 09, 2008 11:24 AM
To: [hidden email]
Subject: weighting pregnancy duration

Hi,

I have a dataset with a pregancy duration variable (weeks). We know that early pregancy durations are registered incompletely. We can assume that (at least for singletons) the distribution of duration is 'negatively skewed normal'; that is, a fairly long tail of early durations, the bulk of the pregancies is of normal duration, and almost no very long durations. How would I go about if I wanted to create a weight that restores this assumed distribution? I read Hector Maletta's paper on spsstools.net already, but it doesn't deal with cases like this.

Eventually, we also need to equalise the proportions of other variables (postal code, for example) to the proportions of a reference dataset. However, the reference dataset does not contain a pregancy duration var.

Cheers!!
Albert-Jan

=====================
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Peck, Jon

Re: weighting pregnancy duration

Raking is available in SPSS through the rake programmability module on Developer Central.

-Jon Peck

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Spousta Jan
Sent: Thursday, October 09, 2008 4:17 AM
To: [hidden email]
Subject: Re: [SPSSX-L] weighting pregnancy duration
[snip]

If you wish to adjust weights also for another variables, use so-called raking (perhaps you'll find it in the archives of the discussion or on Raynald's pages).

HTH

Jan

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