How to extract p-value from regress and corrcoef ?
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Belal Abboushi
on 5 Mar 2015
Answered: aikaterini vraka
on 4 Jun 2021
Hello everyone,
I was able to write the code to run regress and corrcoef but didn't know how to get the p value.
What exactly do i need to write before = in order to get these values? [ ?? ]= regress(speed',weight)
Any idea how to get these out of regress and corcoeff?
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Accepted Answer
Star Strider
on 5 Mar 2015
From the documentation for regress:
[b,bint,r,rint,stats] = regress(y,X) returns a 1-by-4 vector stats that contains, in order, the R² statistic, the F statistic and its p value, and an estimate of the error variance.
From the documentation for corrcoef:
[R,P]=corrcoef(...) also returns P, a matrix of p-values for testing the hypothesis of no correlation. Each p-value is the probability of getting a correlation as large as the observed value by random chance, when the true correlation is zero. If P(i,j) is small, say less than 0.05, then the correlation R(i,j) is significant.
I can’t describe it better than the documentation does.
More Answers (1)
aikaterini vraka
on 4 Jun 2021
Hi,
Just a question. Since regression shows the one-way relationship, should I get the same p-value and R-squared if I interchange predictor and response variables? Or should they vary?
I use the same function but when I write e.g regress(weight,speed ), I see the same p-values as before and the only term that varies is the error variance? Is this correct?
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