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jdura50
05-12-2008, 01:51 AM
Usually a Likert scales have 5 levels. Sometimes 7, 9 or 11.
But the final objective normally is reduced to 3 levels. For example:
1) People think that A is better than B
2) People think that A is similar to B
3) People think that A is worst than B

Recently I was discussing with a workmate if it is better to use 3
levels in our questionnaires.
My workmate thinks that 3 levels are more clear for elderly people and
time is saved.
Then, why researchers use 5 or more levels? Tradition?
I would like to find a scientific reference in order to justify that
the number of levels must be 5 or more.

Thanks in advance.


Dr. Juan V. DurĂ¡

INSTITUTO DE BIOMECANICA DE VALENCIA
www.ibv.org ( http://www.ibv.org/ )