CODEWITHSUNDEEP
rp-value
R Beginner
R Beginner

Reputation: 109

Understanding P-Values in R - easy

When looking at the table of coefficients for models it lists ., *, **, or *** next to the P-values.

They state this at the bottom (but I find this is what actually confuses me):

Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

One of my models has a P value of 0.00506 with **. But that doesn't make sense to me according to the line above. I think I've made it a lot more confusing than it actually is!

So in painfully simple terms what do the *, **, ***'s equate to?

Upvotes: 0

Views: 5940

Answers (1)

G. Grothendieck
G. Grothendieck

Reputation: 269694

This shows the cutpoints (the numbers) and the number of stars if the pvalue is between the cutpoints on either side of the stars so:

 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

means that

  • if the pvalue is between 0 and 0.001 then it will have 3 stars,
  • if it is between 0.001 and 0.01 it will have 2 stars,
  • if it is between 0.01 and 0.05 it will have 1 star,
  • if it is between 0.05 and 0.1 it will have a dot and
  • if it is between 0.1 and 1 it will not have anything (just a space).

0.00506 is between 0.001 and 0.01 so it has 2 stars.

Look at the source code to the function printCoefmat to see the actual code that does it. You can find it here .

Upvotes: 7

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