Statistical Power

[Celso-3]

Hello all,

Does anyone here have an Excel Sheet that computes Statistical Power?

Any suggestion?

Thanks in advance?
Celso
PhD student


               
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[Dr. Jeffrey D. Leitzel-2]

Hi Celso,
Not a spreadsheet, but g power is an excellent option. And it is free.
http://www.psycho.uni-duesseldorf.de/aap/projects/gpower/

Best, Jeff
Jeffrey D. Leitzel, Ph.D.
Assistant Professor, Department of Psychology
Office: McCormick 2123
Bloomsburg University
400 East Second Street
Bloomsburg, PA  17815
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> -----Original Message-----
> From: SPSSX(r) Discussion [mailto:[hidden email]]
> On Behalf Of Celso
> Sent: Saturday, February 24, 2007 11:18 AM
> To: [hidden email]
> Subject: Statistical Power
>
> Hello all,
>
> Does anyone here have an Excel Sheet that computes Statistical Power?
>
> Any suggestion?
>
> Thanks in advance?
> Celso
> PhD student
>
>
>
> ___________________________________________________________
> What kind of emailer are you? Find out today - get a free
> analysis of your email personality. Take the quiz at the
> Yahoo! Mail Championship.
> http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk
>

[Melissa Ives]

Go to http://www.chestnut.org/LI/downloads/index.html#Research%20Tools
And check out the file eswk.xls.  I believe it will do what you want.

Melissa
The bubbling brook would lose its song if you removed the rocks.
-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Celso
Sent: Saturday, February 24, 2007 10:18 AM
To: [hidden email]
Subject: [SPSSX-L] Statistical Power

Hello all,

Does anyone here have an Excel Sheet that computes Statistical Power?

Any suggestion?

Thanks in advance?
Celso
PhD student


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[Melissa Ives]

Ahh...try this reference for a priori decision calculations:

Dennis, M.L., Lennox, R.D., & Foss, M. (1997). Practical power analysis
for substance abuse health services research. In K. J. Bryant, M.
Windle, & S.G. West (Eds.), The science of prevention: Methodological
advances from alcohol and substance abuse research (pp. 367-404).
Washington, DC: American Psychological Association.

I understand there are several power calculations on-line see
http://statpages.org/#Power for a list of at least some of them,
including  http://www.raosoft.com/samplesize.html or
http://www.macorr.com/ss_calculator.htm or
http://www.dssresearch.com/toolkit/sscalc/size_p1.asp or
http://www.surveysystem.com/sscalc.htm for particular calculators (These
are not an Excel sheets).

Melissa
The bubbling brook would lose its song if you removed the rocks.
________________________________

From: kornbrot [mailto:[hidden email]]
Sent: Tuesday, February 27, 2007 1:39 AM
To: Melissa Ives
Subject: Re: Statistical Power



Quite nice for 2 group comparisons: means, corr, chi-squ  
Although more useful if calculations for pooled or separate variance
given

It is for watchers NOT doers, as it gives power for already completed
studies, but not N to detect a given effect size with given power a
priori
Also no calculation of number needed to treat

G* takes a lot of beating!
http://www.psycho.uni-duesseldorf.de/abteilungen/aap/gpower3/
<http://console.mxlogic.com/redir/?kTDQjhOOUCrjuvKDtdwS02mEmIjHPs95Q6_Fj
PQaNtV3YQxfV7JM8_3dRr2aRj7NpMTvHEFTj79T7fCXCQe_yJoM8hHc54_zeDrrCOFIsUYCr
hh79LK8CzBZcSCyr1vF6y0oDIVkDaSDCy0blcv4TfM-ub7Xa1J4SOrjuvKyqehNEVdD9HaUY
IAt3X>

Best

diana


On 26/2/07 16:45, "Melissa Ives" <[hidden email]> wrote:



        Go to
http://www.chestnut.org/LI/downloads/index.html#Research%20Tools
<http://console.mxlogic.com/redir/?arPW9EVpsjdFLfTjKCMr01m9_is6VY01MaxK8
lcgfHG5c0Lws1wb-DX6NcuDs4RGvgTvHEFTj79T7fCXCQe_yJoM8hHc54_zeDrrCOFIsUYCr
hh79LK8CzBZcSCyr1vF6y0oDIVkDaSDCy0blcv4TfM-ub7Xa1JcSOrjuvKyqehNEVdD9HaUY
IAt3X>
        And check out the file eswk.xls.  I believe it will do what you
want.
       
        Melissa
        The bubbling brook would lose its song if you removed the rocks.
        -----Original Message-----
        From: SPSSX(r) Discussion [mailto:[hidden email]] On
Behalf Of
        Celso
        Sent: Saturday, February 24, 2007 10:18 AM
        To: [hidden email]
        Subject: [SPSSX-L] Statistical Power
       
        Hello all,
       
        Does anyone here have an Excel Sheet that computes Statistical
Power?
       
        Any suggestion?
       
        Thanks in advance?
        Celso
        PhD student
       
       
        PRIVILEGED AND CONFIDENTIAL INFORMATION
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        addressee. If you are not the designated recipient, or an
employee
        or agent authorized to deliver such transmittals to the
designated
        recipient, you are hereby notified that any dissemination,
        copying or publication of this transmittal is strictly
prohibited. If
        you have received this transmittal in error, please notify us
        immediately by replying to the sender and delete this copy from
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        system. You may also call us at [phone] for assistance.
       
       



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

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