Why do you want to use only a 4 point Likert scale?
_The more you restrict the variance of a variable the more you
restrict its possible covariance._
As a rule of thumb you want items to approximate a continuous
construct as much as possible given who your respondents are.
An actual Likert item has 5 points SD D ? A SA. Do you have a
Disagree to Agree construct for your response scale?
If your scale has many items, the total (mean) score might not be
too restricted.
If you do not have scales, but are measuring a construct with a
single variable the restriction of variance and therefore on
covariance is even more problematical.
In short, a 4 point response scale is usually inadvisable. Why
coarsen your measurement any more than is really necessary?
Art Kendall
Social Research Consultants
On 10/17/2011 1:13 PM, Mohamed wrote:
Hi
I intend to use a 4 point Likert scale format in my survey.
I want to know if this puts limitations on the type of statistical analysis
tests conducted?
Regards
Mohamed
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