No, so the probability means that's the probability of getting that data by
chance, so a p-value of .9997 means there is a .9997 probability that the
data could be acquired by chance. This is a very simplistic view and you
should study the regression model better.

 

Joe King

206-913-2912

jp@joepking.com

"Never throughout history has a man who lived a life of ease left a name
worth remembering." --Theodore Roosevelt

 

From: John Paul Telthorst [mailto:jptelthorst@gmail.com] 
Sent: Sunday, December 20, 2009 10:36 PM
To: Joe King
Subject: Re: [R] Signif. codes

 

Thanks for the reply, I definitely do need to understand the regression
model better.  I got a p-value of .9997, so that would be > .05?  I guess
I'm confused about the significance part you talked about.

 

John

On Mon, Dec 21, 2009 at 12:27 AM, Joe King <jp@joepking.com> wrote:

There will always be uncertainty in your estimates so you don't have 0
percent chance of being wrong, but remember that's your intercept, your
regressors are not significant. Although you can say it is less than ..05, I
mean if its significant at .000000000000001 (or something like that), that's
less than .05, so its not unethical to say p < .05, but it sounds like you
need to understand the regression model a little better. Joe King
206-913-2912 jp@joepking.com "Never throughout history has a man who lived a
life of ease left a name worth remembering." --Theodore Roosevelt
-----Original Message----- From: r-help-bounces@r-project.org
[mailto:r-help-bounces@r-project.org] On Behalf Of John Paul Telthorst Sent:
Sunday, December 20, 2009 10:13 PM To: r-help@r-project.org Subject: [R]
Signif. codes My question is about the "Signif. codes" and the p-value,
specifically, the output when I run summary(nameofregression.lm) So you get
this little key: Signif. codes:  0   0.001   0.01   0.05   0.1  And on a
regression I ran, next to the intercept data, I get '***' Coefficients: >
Estimate Std. Error t value Pr(>|t|) > (Intercept)  7.95652    0.59993
13.262   <2e-16 *** > day.f2      -0.04348    0.84843  -0.051    0.959 >
day.f3      -0.13043    0.84843  -0.154    0.878 > day.f4      -0.21739
0.84843  -0.256    0.798 > day.f5       0.02174    0.84843   0.026    0.980
> day.f6      -0.15217    0.84843  -0.179    0.858 > day.f7       0.14986
0.84390   0.178    0.859 Does this mean that these numbers have a 0% chance
of being wrong?  Is there a way to change this to the .05 level of
significance? Thanks, John [[alternative HTML version deleted]]
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-- 
John Telthorst, MHRIR
University of Illinois Alumnus


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