Repeated Measures Question

[ad19]

I have a question regarding repeated measures ANOVA. The situation is this:

I have a group of 12 subject that conducted a fatigue task till failure under two different conditions. I have an EMG measure every 5% for a total of 19 measures across the fatigue task (the first 5% was used to normalize the remaining 19 measures).

My within-subject variable are the EMG measures across time (called EMG) and my between-subject variable is the angle of the joint at which the fatigue task was conducted (angle)

I have a significant effect of EMG and a significant interaction of EMG*Angle.

My question is how do I find out at which point in the fatigue task do the two groups become significantly different. I can't run any post hoc tests as SPSS says I require 3 groups.

Does anybody know what to do here? Can I just perform repeated pairwise t-tests? I know about the Bonferroni correction but since I am doing 19 tests it would reduce my alpha value to .002 which is fairly conservative and I end up detecting no significance.  Any help would be greatly appreciated.

Thanks.

[Sara House]

The first thing I thought when I read your question was "Growth curve analysis".  I'm still new to the topic so as far as how to do it, I can't offer a lot of assistance.  But I think that's how you would have to approach this topic.  You mention using ANOVA, so you're probably interested in means, whereas an SEM procedure like growth curve analysis examines variance-covariance.  I know you can do means model analysis in SEM, and you might be able to combine that procedure with growth curve analysis by throwing a constant into the equation (at least, that's what you do in latent means models).
 
Anybody more familiar with growth curve analysis have any suggestions?
 
Sara
 
Sara M. House, M.A.
Adjunct Faculty
Loyola University Chicago, Psychology Department
Email: [hidden email]
Teaching: Research Methods, Psychology & Law

>>> ad19 <[hidden email]> 10/1/2008 12:21 PM >>>
I have a question regarding repeated measures ANOVA. The situation is this:

I have two groups that conducted a fatigue task till failure. I have an EMG
measure every 5% for a total of 19 measures across the fatigue task (the
first 5% was used to normalize the remaining 19 measures).

My within-subject variable are the RMS measures across time (called RMS) and
my between-subject variable is the angle of the joint at which the fatigue
task was conducted (angle)

I have a significant effect of RMS and a significant interaction of
RMS*Angle.

My question is how do I find out at which point in the fatigue task do the
two groups become significantly different. I can't run any post hoc tests as
SPSS says I require 3 groups.

Does anybody know what to do here? Can I just perform repeated pairwise
t-tests? I know about the Bonferroni correction but since I am doing 19
tests it would reduce my alpha value to .002 which is fairly conservative
and I end up detecting no significance.  Any help would be greatly
appreciated.

Thanks.
--
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[Maguin, Eugene]

I don't know if anyone can help me with this but ...

I have a site-licensed copy of 16 and the database wizard lists six drivers
(dbase, excel, access, MS SQL server 6, MS sybase sql, oracle 7, and oracle
8). Thing is we don't know where they came from. Other site-licensed copies
here do not have these drivers. Were these drivers provided on the
installation cds and I just got lucky? I've talked to our network guy and he
doesn't know. I did have a driver for Lotus notes on my computer but that
was several versions ago of both spss and notes. Lastly, where would we
download the drivers from? Any help appreciated.

Thanks, Gene Maguin

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[Mark A Davenport MADAVENP]

This is what comes in the Data Access Pack, No?  That should be on the CD.
 Otherwise you should be able to get it via download from SPSS.

http://www.spss.com/drivers/sdap.htm

***************************************************************************************************************************************************************
Mark A. Davenport Ph.D.
Senior Research Analyst
Office of Institutional Research
The University of North Carolina at Greensboro
336.256.0395
[hidden email]

'An approximate answer to the right question is worth a good deal more
than an exact answer to an approximate question.' --a paraphrase of J. W.
Tukey (1962)






Gene Maguin <[hidden email]>
Sent by: "SPSSX(r) Discussion" <[hidden email]>
10/02/2008 11:11 AM
Please respond to
Gene Maguin <[hidden email]>


To
[hidden email]
cc

Subject
ODBC drivers






I don't know if anyone can help me with this but ...

I have a site-licensed copy of 16 and the database wizard lists six
drivers
(dbase, excel, access, MS SQL server 6, MS sybase sql, oracle 7, and
oracle
8). Thing is we don't know where they came from. Other site-licensed
copies
here do not have these drivers. Were these drivers provided on the
installation cds and I just got lucky? I've talked to our network guy and
he
doesn't know. I did have a driver for Lotus notes on my computer but that
was several versions ago of both spss and notes. Lastly, where would we
download the drivers from? Any help appreciated.

Thanks, Gene Maguin

=====================
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
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=====================
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[Oliver, Richard]

From the Help (note the URL at the bottom):

ODBC Data Sources
If you do not have any ODBC data sources configured, or if you want to add a new data source, click Add ODBC Data Source.

* On Linux operating systems, this button is not available. ODBC data sources are specified in odbc.ini, and the ODBCINI environment variables must be set to the location of that file. For more information, see the documentation for your database drivers.


*  In distributed analysis mode (available with SPSS Statistics Server), this button is not available. To add data sources in distributed analysis mode, see your system administrator.

An ODBC data source consists of two essential pieces of information: the driver that will be used to access the data and the location of the database you want to access. To specify data sources, you must have the appropriate drivers installed. Drivers for a variety of database formats are available at http://www.spss.com/drivers.


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Gene Maguin
Sent: Thursday, October 02, 2008 10:08 AM
To: [hidden email]
Subject: ODBC drivers

I don't know if anyone can help me with this but ...

I have a site-licensed copy of 16 and the database wizard lists six drivers
(dbase, excel, access, MS SQL server 6, MS sybase sql, oracle 7, and oracle
8). Thing is we don't know where they came from. Other site-licensed copies
here do not have these drivers. Were these drivers provided on the
installation cds and I just got lucky? I've talked to our network guy and he
doesn't know. I did have a driver for Lotus notes on my computer but that
was several versions ago of both spss and notes. Lastly, where would we
download the drivers from? Any help appreciated.

Thanks, Gene Maguin

=====================
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

=====================
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