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Re: p value for spearman's correlation
From: |
Alan Mead |
Subject: |
Re: p value for spearman's correlation |
Date: |
Sat, 26 Dec 2020 13:57:24 -0600 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 |
John,
My understanding was that Spearman's Rho is simply Pearson's r
calculated on ranked data. If so, you can interpret them identically
(other than the effect of ranking, which may be substantial),
including using the same hypothesis test.
Isn't it a bug if there is a space for p-value and it's blank?
If you're saying that PSPP censors the p-value for small samples,
that seems like the main use-case for using p-values. I just checked
and the introductory stats book I taught from (Howell's
undergraduate "Fundamental Statistics for the Behavioral Sciences")
only has a couple pages on Spearman's Rho, but confirms the above
and doesn't say anything about the hypothesis test being "wildly
inaccurate" for small samples? I mean, all estimates from small
samples are "wildly inaccurate," right?
-Alan
On 12/26/2020 6:22 AM, John Darrington
wrote:
It N is large the significance of Spearman's Rho can be estimated using the
T statistic. This is what SPSS does in its NPAR TEST CORR command. However
it is wildly inaccurate for small values of N and SPSS has taken a lot of
criticism for it.
J'
On Sat, Dec 26, 2020 at 12:45:26PM +0530, Ramagokula Krishnan wrote:
Hi,
Hope you are safe and well. First of all, thanks for making this software a
reality. Many of my students in India are benefiting from this.
This is a small query I have with regard to Spearman's Rank Correlation
using ordinal variables. There is an option to perform the test under the
crosstab option which is great. However, the p value (significance) is not
shown in the output.
I've attached a screenshot of the output. Please have a look at the bottom
most table which has the correlation values but the significance has not
been mentioned.
It would be great if there was a workaround through which I could estimate
the p value as well.
Thank you in advance
Dr. S. Rama Gokula Krishnan
--
Alan D. Mead, Ph.D.
President, Talent Algorithms Inc.
science + technology = better workers
http://www.alanmead.org
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- p value for spearman's correlation, Ramagokula Krishnan, 2020/12/26
- Re: p value for spearman's correlation, John Darrington, 2020/12/26
- Re: p value for spearman's correlation,
Alan Mead <=
- Re: p value for spearman's correlation, Ben Pfaff, 2020/12/26
- Re: p value for spearman's correlation, Alan Mead, 2020/12/26
- Re: p value for spearman's correlation, John Darrington, 2020/12/26
- Re: p value for spearman's correlation, Alan Mead, 2020/12/26
- Re: p value for spearman's correlation, Alex Ernesto Davila Davila, 2020/12/26
- Re: p value for spearman's correlation, Alan Mead, 2020/12/27
- Re: p value for spearman's correlation, John Darrington, 2020/12/27
- Re: p value for spearman's correlation, Ben Pfaff, 2020/12/27
- Re: p value for spearman's correlation, Alan Mead, 2020/12/27
- Re: p value for spearman's correlation, Alex Ernesto Davila Davila, 2020/12/27