Date: Tue, 29 Jan 2008 06:15:36 0500
ReplyTo: Shin <shintaro.okazaki@UAM.ES>
Sender: "SPSSX(r) Discussion" <SPSSXL@LISTSERV.UGA.EDU>
From: Shin <shintaro.okazaki@UAM.ES>
Subject: Bonferroniadjusted ttests
Dear all:
I have a question regarding ttests. One of the reviewers suggested me to
perform "Bonferroniadjusted ttests". I understand that Bonferroni is one
of the post hoc methods in MULTIPLE group comparisons of ANOVA. However,
our study deals with only TWO groups.
His/her main argument is that our results of twogroup comparison
generated very small means, but probably due to a relatively large sample
size (n1=870, n2=780), ttests detected statistical significance at 0.05,
which may not have any practical meaning. Therefore, he/she suggested us
to "adjuste the alpha level." He/She implies that if I indeed adjust the
alpha, some of the comparisons may not result in statistical significance.
Could anybody explain how we could perform Bonferroniadjusted ttests IN
A TWOGROUP COMPARISON via SPSS? I have looked at the main menu but could
not find any option of this kind, except in ANOVA as a post hoc option.
Thank you for your help in advance.
Shin
S. Okazaki
Autonomous University of Madrid
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