How should I account for multiple comparisons when looking at p values?

Posted by Martha Hewett on Aug 14, 2011; 4:52pm
URL: http://spssx-discussion.165.s1.nabble.com/How-should-I-account-for-multiple-comparisons-when-looking-at-p-values-tp4698517.html

I am comparing 7 groups on multiple dimensions (demographics, attitudes,
actions).  Some comparisons are across all groups and some are among 2 or 3
or 4 of the groups.  They include ANOVAs, chi-squares and t tests.  I know
with so many comparisons some will be significant by chance.  How should I
adjust for this?  Also, should such an adjustment be made within types of
questions (e.g. within demographics, within attitudes, and within actions)
or across all items compared?

Thanks for any help you can provide.

=====================
To manage your subscription to SPSSX-L, send a message to
[hidden email] (not to SPSSX-L), with no body text except the
command. To leave the list, send the command
SIGNOFF SPSSX-L
For a list of commands to manage subscriptions, send the command
INFO REFCARD