Date: Fri, 1 Sep 2006 11:31:23 +0200
Reply-To: Spousta Jan <JSpousta@CSAS.CZ>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Spousta Jan <JSpousta@CSAS.CZ>
Subject: Re: change of perceptions
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1) It is possible that there is no clear "turning point" - rather, the
changes may be continuous, eg. every year of age may change the
perception by 0.01 p. Try to plot the means of the Likert scale against
the age groups say 10 years wide and look for possible turning points.
2) An useful method for detecting breakpoints of this type are decision
trees - run a tree (C5, CART, CHAID or whatever you like) with the
likert scale as dependent/target variable and age as the predictor.
From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of
DR VEENA Joshi
Sent: Friday, September 01, 2006 11:22 AM
Subject: change of perceptions
We have done a survey on perceptions about healthcare system using
likert scale (1 to 5). One of the demographic variable is age which is
I categorized age into 3 groups <40, 40 - 60 and >60 and found that
respondents perceptions/attitude differ age groupwise.
I would like to find the truning point at which the difference exists.
How do I get this?
I am trying to get small age groups say 5 years, but the age ranges from
18 to 90 years.