[R] power?

SNN s.nancy1 at yahoo.com
Wed Oct 7 16:30:47 CEST 2009

```Thanks Simon for the help.

Simon Blomberg-4 wrote:
>
> The short answer is Yes. If you reject the null hypothesis based on that
> p-value, then by definition you had enough power to do that. This is
> because there is a precise inverse relationship between the p-value and
> the "observed" power, once you fix the effect size and the sample size.
> In other words, your post-hoc power analysis would be a simple
> re-statement of the p-value. There is no extra information that can be
> gained from such an analysis. See:
>
> The American Statistician, February 2001, Vol. 55, No. 1, pp 19-24
>
> Don't bother with your power analysis, unless you are planning a new
> experiment.
>
> Simon.
>
> On Tue, 2009-10-06 at 13:49 -0700, SNN wrote:
>> Hi,
>>
>> I have used multiple linear regression on a data set and one if the
>> regressor was significant with a p-value =0.01
>>
>> I need to calculate the power for a multiple linear regression. i.e. do I
>> have enough power to believe the above p-value?
>>
>>
>>
>>
>
>
> --
> Simon Blomberg, BSc (Hons), PhD, MAppStat.
> Lecturer and Consultant Statistician
> School of Biological Sciences
> The University of Queensland
> St. Lucia Queensland 4072
> Australia
> Room 320 Goddard Building (8)
> T: +61 7 3365 2506
> http://www.uq.edu.au/~uqsblomb
> email: S.Blomberg1_at_uq.edu.au
>
> Policies:
> 1.  I will NOT analyse your data for you.
>
> Statistics is the grammar of science - Karl Pearson
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
>

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