How to extract p-value from regress and corrcoef ?

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?

Answer 1

[Star Strider]

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.

[Belal Abboushi]

Thank you!

[Star Strider]

My pleasure!

Answer 2

[aikaterini vraka]

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?