Posted by
peter link on
Jun 09, 2016; 6:08pm
URL: http://spssx-discussion.165.s1.nabble.com/One-tail-vs-two-tail-results-using-Hayes-Process-Mediational-analysis-tp5732365p5732369.html
To confirm what Bruce wrote - The Indirect Effect is the multiplication of 2
point estimates, so the variance (and CI) are bootstrapped.
peter
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Bruce Weaver
Sent: Thursday, June 09, 2016 10:40 AM
To:
[hidden email]
Subject: Re: [SPSSX-L] One tail vs two tail results using Hayes Process
Mediational analysis
Disclaimer: I have never used the PROCESS macro. However, I have heard
people talking about it, and based on what I've heard, I wonder if the CIs
are bootstrap CIs. If they are, and if the test is not obtained via
bootstrapping, then one could easily get the kind of result you describe.
HTH.
msherman wrote
> Dear List: I just used Hayes' Process macro within spss 23.0 to test
> for an indirect mediational effect and have a result which is a little
> confusing. The print out for the indirect effect shows that the 95% CI
> for the indirect coefficient is -0.00097 (lower Limit) and 0.25978
> (Upper
> limit) with a Z value of 2.09 and a p value of .03641. Since the 95%
> CI includes zero the results are not statistically significant yet the
> p value is statistically significant. Is this inconsistency due the p
> value representing only one tail whereas the 95% CI utilizes two tails
> (which would relate to .03641 X 2 = .07282 and thus would include zero
> contained within the 95% CI)? I looked at another result where the Z
> value was 0.95 and it had a p value of .34338 which, to me, suggests
> that this value represents .17169 in each tail or a total p value of
> .34338. If this is correct then the p value for the Z of 2.09 actually
> is .018205 in one tail and .03641 in two tails (.018205 X 2 =
> .03641). If so then the 95% CI should not contain the value of zero. What
am I missing?
>
> Martin F. Sherman, Ph.D.
> Professor of Psychology
> Director of Master's Education: Thesis Track
>
> Department of Psychology
> 222 B Beatty Hall
> 4501 North Charles Street
> Baltimore, MD 21210
> msherman@
> <mailto:
> msherman@
> >
> 410-617-2417 tel
> 410-617-5341 fax
>
>
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