Power
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- This topic has 24 replies, 21 voices, and was last updated 14 years, 3 months ago by
Ashman.
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February 27, 2008 at 12:58 pm #49452
Hello,
I know that the “Power” of an experiment is important to make sure the correct answer is obtained, but I am having trouble getting my head round how “Power” works and how to calculate the level of power within an experiment. Can anyone help – in lay mans (or womans!) terms?
Thanks
Joe
0February 27, 2008 at 3:02 pm #169034Statistical power is defined as the probability of rejecting a false null hypothesis. It is 1 minus beta, where beta is the probability of failing to reject a false null hypothesis. Power depends upon alpha (Type I Error), beta (Type II Error), sample size, effect size, and the directionality of the statitsical test. Generally speaking, statisticians try to increase power by increasing sample size. You will need to use a statistical software program or tables to compute power.
0March 6, 2008 at 1:01 pm #169304Joe,
Think of power in this manner. If there is a distribution of innocent people that get pulled into a court of law charged with a crime they did not commit then the alpha risk is the portion of that distribution of people that have bad lawyers, planted evidence and a corrupt judge. The power comes from another distribution that consists of really bad people that definitely commit crimes. The power comes from the risk of the judge/jury thinking that you may belong to this particular group because they have been able to shift their distribution towards the innocent distribution through the use of a great lawyer and getting rid of the evidence. As the criminal distribution begins to over lap the innocent distribution, the amount of the criminal distribution that is overlapped is the power. If you can give me your email I will send you a power point that makes this more clear because you can then see the pictures.0March 6, 2008 at 1:27 pm #169305Joe:
Could you send a copy of your ppt at teyang at hotmail.com? Thank you.
Te
0March 6, 2008 at 1:54 pm #169306
SwaggertyParticipant@GeorgeInclude @George in your post and this person will
be notified via email.Same here, Joe…I’ve been trying to explain it to a bunch of guys without getting them muddled up.
Email id is [email protected]0March 6, 2008 at 2:14 pm #169307Please send the ppt. Thanks in advance.
[email protected]0March 6, 2008 at 4:01 pm #169312can you please send me a copy too.
[email protected]
thanks in advance0March 6, 2008 at 6:33 pm #169316
Eoin BarryParticipant@EoinBarryInclude @EoinBarry in your post and this person will
be notified via email.Hello Jen – I would appreciate a copy of that presentation too :)
Best regards,
Eoin
[email protected]0March 6, 2008 at 10:49 pm #169324Hi Jen,
I would be interested in seeing a copy of the presentation as well. Please send it to [email protected].
Thank you0March 6, 2008 at 10:52 pm #169325Hi Jen,
Please forward me a copy of the power presentation also.
Regards
Rob
[email protected]
0March 7, 2008 at 9:02 am #169340
Joe NolanParticipant@Joe-NolanInclude @Joe-Nolan in your post and this person will
be notified via email.Thanks very much for all you help.
cheers
Joe0March 7, 2008 at 11:19 am #169343A good visualizaton of this concept can be seen if you download a trial copy of JMP, and then download the Oneway ANOVA script. This is a dynamic illustration of relationhip of sample size, alpha, power, difference to detect, etc.
0March 7, 2008 at 1:40 pm #169344I would greatly appreciate a copy of the PPT.
My email is (a3echo9 @ yahoo dot com )
Thanks0March 7, 2008 at 1:47 pm #169345Paul,
I tried sending it to the email you gave me and I am getting an undeliverable message.
jen0March 7, 2008 at 1:54 pm #169346Lets try my trusted an proven email addy.
Thanks
[email protected]0March 7, 2008 at 1:56 pm #169347Neo,
I get an undeliverable message when I send to the address you provided me with. Do you have another?
Jen0March 8, 2008 at 1:17 am #169378Hi Jen,
Could you share your ppt with me as well? Thanks!!
[email protected]0March 8, 2008 at 3:46 am #169380
aiman faridParticipant@aiman-faridInclude @aiman-farid in your post and this person will
be notified via email.Hi everybody,
I am interested in power, errors & sample size, May I share your PPT?
Thanks alot in advance. [email protected]
Aiman0March 8, 2008 at 6:22 am #169386hi
could u share ppt to my e-mail ID [email protected]
thanks0March 8, 2008 at 6:39 am #169388
SpielbergMember@SpielbergInclude @Spielberg in your post and this person will
be notified via email.Jen
Please send it to my [email protected]
and I may share with you an impressive PPT on DFSS,
thanks and regards0March 10, 2008 at 1:13 pm #169464
MC WallParticipant@MC-WallInclude @MC-Wall in your post and this person will
be notified via email.Jen,
Could you please send a copy to me as well? [email protected].
Thanks for sharing!0March 10, 2008 at 11:28 pm #169498Jen,
Please forward a copy to me, also.
Thanks in advance.
Chuck0March 10, 2008 at 11:30 pm #169499Jen,
Pls forward a copy of the ppt you mentioned to:
[email protected]
Thank you
Chuck0March 11, 2008 at 8:19 am #169511Jen,
would appreciate a copy of the ppt to this address
[email protected]
Many thanks in advance.0March 14, 2008 at 5:10 pm #169699Joe: would you please send me a copy of your Power Point – sounds like many like it – it must be good!!
Thanks Steve0 -
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