[R] p-value and significance code

Paul Suckling paul.suckling at gmail.com
Wed Apr 11 02:33:28 CEST 2007

Dear R list members.

Is there anyone out there that might be able to explain the difference
between p-values and significance codes for terms in a linear
regression model (as given by summary.lm for example) for me please?

Do they both give the probability that the observed variation in the
dependent variable due to a given term (or all terms, depending how
they are used) in the model could have been obtained by chance for

I am confused because I have an article which refers to p-values for
individual terms in a linear regression model. They happen to use the
same star syntax when referring to p-values as R's summary.lm command
does for significance codes. R's summary command only gives one
p-value for the whole model though. I have tried searching for help on
"significance code" in the R docs and this list to see what it is
actually being calculated, but to no avail.



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