Date:         Thu, 22 Sep 2005 09:15:29 -0600
Reply-To:     Adrian Musters <Adrian.Musters@nurs.utah.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Adrian Musters <Adrian.Musters@nurs.utah.edu>
Subject:      Standard Error
Content-Type: text/plain; charset=US-ASCII

Hi everyone,

I did a one-way ANOVA in SPSS 13 with a Tukey HSD Post-Hoc test.  In
the output I noticed that the Standard Error in the Multiple Comparisons
table was 17.30069 for each and every comparison.  I am comparing the
amount of foraging in 4 different types of grass, each with 5
observations.  My understanding is that the Standard Error is calculated
by dividing the Standard Deviation by the square root of the number of
observations -  SD/sqrt(N)

Is the standard deviaiton that is used the standard deviation of the
whole group (N=20)?  Mine is 37.44094 .  So I'm wondering about the
calculation.  37.44094 / sqrt (5) = 16.7440974.  Am I wrong about the
calculation for the SE?  If not, is there anyone who is able to explain
the discrepancy of .55 in the two SEs?

Thanks in advance,
Adrian