Posted by
bdates on
May 29, 2013; 8:53pm
URL: http://spssx-discussion.165.s1.nabble.com/Percent-Change-Crosstabs-tp5720440p5720473.html
I've been using NNT for years, together with the Common Language Effect Size and Cohen's U1, U2, and U3 because they all speak to people who are more statistically naïve. It's too much to ask for everything, so I'll second Bruce's motion that NNT be added in a future release.
Brian
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of Bruce Weaver
Sent: Wednesday, May 29, 2013 4:33 PM
To:
[hidden email]
Subject: Re: Percent Change Crosstabs
Thanks Gene. For completeness, the reciprocal of the absolute risk reduction
(at least in studies involving treatment vs control) is called the "number
needed to treat" (NNT). Clinicians seem to like it as a measure of effect.
It tells them how many patients they need to treat in order for one to
benefit. There is also number needed to harm (NNH) if one is talking about
unwanted side effects, for example.
@Rich -- I agree that the thread probably did become more complicated than
necessary if the situation is limited to 2x2 tables. It's my fault it got
that complicated. My excuse (if you will) is that I was pretty certain the
OP wanted the risk difference with its CI, and they won't get that (at least
not easily) from CROSSTABS output.
@Jon -- Is there any possibility (in a future release) of having the risk
difference (and maybe NNT) added to the output one gets when including RISK
on the STATISTICS sub-command? That would be quite useful, I think.
Cheers,
Bruce
Maguin, Eugene wrote
> I enjoyed this discussion because I learned about risk difference and risk
> ratio, neither of which I'd heard of before. So, thanks to Bruce, Ryan,
> and Rich.
>
> Gene Maguin
-----
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