Re: P value in CORR or CORRCOEF
- From: arun <aragorn168b@xxxxxxxxx>
- Date: Sun, 16 Aug 2009 19:49:36 -0700 (PDT)
On Aug 16, 8:26 pm, "Lin " <skybird_sbREM...@xxxxxxxxx> wrote:
Hello!
I have a question about the CORR(or CORRCOEF) function.
In the corr document:
[RHO,PVAL] = corr(...) also returns PVAL, a matrix of p-values for testing the hypothesis of no correlation against the alternative that there is a nonzero correlation. Each element of PVAL is the p-value for the corresponding element of RHO. If PVAL(i, j) is small, say less than 0.05, then the correlation RHO(i, j) is significantly different from zero.
What happend if some p values bigger than 0.05?(eg. 0.7) Does that mean those corresponding correlations RHO are not so "reliable"? Can I use those RHO? Or I should look for some other ways?
TIA
Regards,
Lin
You set your null hypothesis as "there is no significant difference
between x and y". if you have a 5% level of significance, alpha =
0.05, then if pVal < alpha, you reject null hypothesis and accept the
alternative hypothesis that the correlation between this particular
(i,j) is significant. Otherwise, you decide there is no correlation or
rho = 0.
hope this helps,
best, arun.
.
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