|Date: ||Thu, 18 Mar 2010 10:28:36 +0000|
|Reply-To: ||Chris Smith <email@example.com>|
|Sender: ||"SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>|
|From: ||Chris Smith <firstname.lastname@example.org>|
|Subject: ||non-parametric one-sample test?|
I have a data set of roughly 50 companies - each were asked to state the
percentage of their work that they would classify as 'green' in nature.
I want to run a test to show that over the sample, this differs from
50%, i.e. on average there is not an even balance between green and
non-green work being done.
If this was a normally distributed variable, I'd run a standard
one-sample t-test - however the distribution is fairly positively skewed
(most companies seem to report between 10-30% - a few report higher),
but with a small spike at 100%. Therefore at the very least trying a
non-paramtric equivalent alongside a t-test seems appropriate - however
going through the SPSS menus I can't find the non-parametric equivalent
to the one-sample t-test. Any ideas/refernces - I'm sure I'm missing
something obvious here!
Thanks in advance for any help
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