Date:         Thu, 18 Mar 2010 12:13:25 -0000
Reply-To:     Martin Holt <m861holt@btinternet.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Martin Holt <m861holt@btinternet.com>
Subject:      Re: non-parametric one-sample test?
Comments: To: Chris Smith <moorcroft19@hotmail.co.uk>
In-Reply-To:  <COL104-W324EFAAC3DFD2EB1E4CD30E92B0@phx.gbl>
Content-Type: multipart/alternative;

Hi Chris,

Would a sign test be the one ?

Best Wishes,

Martin Holt
  ----- Original Message ----- 
  From: Chris Smith 
  To: SPSSX-L@LISTSERV.UGA.EDU 
  Sent: Thursday, March 18, 2010 10:28 AM
  Subject: non-parametric one-sample test?


HiI 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 helpChris

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