T-Test

[Ruben Reyes]

I am having difficulty computing t-tests for multiple variables.  For
example:  Are there significant differences between EOG test scores in
reading and mathematics (i.e,. 6th grade reading, 6th grade math, 7th
grade reading, 7th grade math, 8th grade reading, and 8th grade math) of
mobile and non-mobile students based on student ethnicity.  The print
out I am receiving only compares groups (i.e., mobility and gender) as
opposed to mobile vs. non-mobile and male vs. female.  I would
appreciate any advice you could give me to resolve this issue.

 

 

 

Ruben A. Reyes, MA

Lead School Psychologist

Cumberland County Schools

910-678-2721

 



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[Beadle, ViAnn]

You need to supply either the syntax you ran or the steps you took in the T-test dialog to generate your output.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Ruben Reyes
Sent: Wednesday, March 07, 2007 2:04 PM
To: [hidden email]
Subject: T-Test

I am having difficulty computing t-tests for multiple variables.  For
example:  Are there significant differences between EOG test scores in
reading and mathematics (i.e,. 6th grade reading, 6th grade math, 7th
grade reading, 7th grade math, 8th grade reading, and 8th grade math) of
mobile and non-mobile students based on student ethnicity.  The print
out I am receiving only compares groups (i.e., mobility and gender) as
opposed to mobile vs. non-mobile and male vs. female.  I would
appreciate any advice you could give me to resolve this issue.







Ruben A. Reyes, MA

Lead School Psychologist

Cumberland County Schools

910-678-2721





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[Oliver, Richard]

This may be an issue of selecting the wrong type of t test or having the wrong type of data structure. A paired samples t tests compares two  variables (columns), such as a variable with pre-test scores and a variable with post-test scores. An independent samples t test compares two-subgroups of a single variable, based on the values of a separate grouping variable, such as income difference between males and females, with income recorded in one variable and gender recorded in another variable.

Maybe you simply selected the wrong type of t test. Alternatively, maybe you need to restructure your data for the appropriate t test.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Beadle, ViAnn
Sent: Wednesday, March 07, 2007 3:50 PM
To: [hidden email]
Subject: Re: T-Test

You need to supply either the syntax you ran or the steps you took in the T-test dialog to generate your output.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Ruben Reyes
Sent: Wednesday, March 07, 2007 2:04 PM
To: [hidden email]
Subject: T-Test

I am having difficulty computing t-tests for multiple variables.  For
example:  Are there significant differences between EOG test scores in
reading and mathematics (i.e,. 6th grade reading, 6th grade math, 7th
grade reading, 7th grade math, 8th grade reading, and 8th grade math) of
mobile and non-mobile students based on student ethnicity.  The print
out I am receiving only compares groups (i.e., mobility and gender) as
opposed to mobile vs. non-mobile and male vs. female.  I would
appreciate any advice you could give me to resolve this issue.







Ruben A. Reyes, MA

Lead School Psychologist

Cumberland County Schools

910-678-2721





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[Kornbrot, Diana]

You need factorial ANOVA, analysis of variance
Multiple t-tests are misleading
1 in 20 will appear to show effects due to chance
they also do not answer your key questions

ANOVA is required training for BPS recognized psychologists

Diana


On 7/3/07 20:04, "Ruben Reyes" <[hidden email]> wrote:

> I am having difficulty computing t-tests for multiple variables.  For
> example:  Are there significant differences between EOG test scores in
> reading and mathematics (i.e,. 6th grade reading, 6th grade math, 7th
> grade reading, 7th grade math, 8th grade reading, and 8th grade math) of
> mobile and non-mobile students based on student ethnicity.  The print
> out I am receiving only compares groups (i.e., mobility and gender) as
> opposed to mobile vs. non-mobile and male vs. female.  I would
> appreciate any advice you could give me to resolve this issue.
>
>  
>
>  
>
>  
>
> Ruben A. Reyes, MA
>
> Lead School Psychologist
>
> Cumberland County Schools
>
> 910-678-2721
>
>  
>
>
>
> ----------------------------------------------------------------
> This e-mail is for the sole use of the individual for whom it
> is intended. If you are neither the intended recipient, nor
> agent responsible for delivering this e-mail to the intended
> recipient, any disclosure, retransmission, copying, or reliance
> on the information contained herein is prohibited. If you have
> received this e-mail in error, please notify the person
> transmitting the correspondence immediately. All e-mail
> correspondence to and from this email may be subject to
> disclosure to any third party upon request, including the
> media. It shall not be necessary to disclose: 1) E-mail
> correspondence which does not constitute a Public Record
> as defined under N.C.G.S. s132.1 or; 2) a public record which
> is exempt from disclosure under other applicable State or
> Federal law.
> ----------------------------------------------------------------
>

Professor Diana Kornbrot
Evaluation Co-ordinator, Blended Learning Unit
University of Hertfordshire
College Lane, Hatfield, Hertfordshire AL10 9AB, UK

email:  [hidden email]
web:    http://web.mac.com/kornbrot/iweb/KornbrotHome.html
         
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[samir-9]

You may try One-way ANOVA from Compare means and Post Hoc with Duncan or LSD
checked where you can consider mobility/ gender as the group variable.



----- Original Message -----
From: "Ruben Reyes" <[hidden email]>
To: <[hidden email]>
Sent: 08 March, 2007 2:04 AM
Subject: T-Test


I am having difficulty computing t-tests for multiple variables.  For
example:  Are there significant differences between EOG test scores in
reading and mathematics (i.e,. 6th grade reading, 6th grade math, 7th
grade reading, 7th grade math, 8th grade reading, and 8th grade math) of
mobile and non-mobile students based on student ethnicity.  The print
out I am receiving only compares groups (i.e., mobility and gender) as
opposed to mobile vs. non-mobile and male vs. female.  I would
appreciate any advice you could give me to resolve this issue.







Ruben A. Reyes, MA

Lead School Psychologist

Cumberland County Schools

910-678-2721





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1:58 PM

[Ornelas, Fermin]

Providing some output results and what your Ho's and Ha's may be
helpful.

Fermin Ornelas, Ph.D.
Management Analyst III, AZ DES
Tel: [phone]
E-mail: [hidden email]

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Beadle, ViAnn
Sent: Wednesday, March 07, 2007 2:50 PM
To: [hidden email]
Subject: Re: T-Test

You need to supply either the syntax you ran or the steps you took in
the T-test dialog to generate your output.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Ruben Reyes
Sent: Wednesday, March 07, 2007 2:04 PM
To: [hidden email]
Subject: T-Test

I am having difficulty computing t-tests for multiple variables.  For
example:  Are there significant differences between EOG test scores in
reading and mathematics (i.e,. 6th grade reading, 6th grade math, 7th
grade reading, 7th grade math, 8th grade reading, and 8th grade math) of
mobile and non-mobile students based on student ethnicity.  The print
out I am receiving only compares groups (i.e., mobility and gender) as
opposed to mobile vs. non-mobile and male vs. female.  I would
appreciate any advice you could give me to resolve this issue.







Ruben A. Reyes, MA

Lead School Psychologist

Cumberland County Schools

910-678-2721





----------------------------------------------------------------
This e-mail is for the sole use of the individual for whom it
is intended. If you are neither the intended recipient, nor
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recipient, any disclosure, retransmission, copying, or reliance
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disclosure to any third party upon request, including the
media. It shall not be necessary to disclose: 1) E-mail
correspondence which does not constitute a Public Record
as defined under N.C.G.S. s132.1 or; 2) a public record which
is exempt from disclosure under other applicable State or
Federal law.
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