Guttman scale is a one way street. Meaning it only has positive values. common example are distance (cm/m/km) or weight (mg/g/kg)
Likert scale is two way street. It has both positive and negative values. Commonly used are survey on perception. Hence a 5 Likert rating would give a 'rubric' of
In the above example Likert possible rating is from -2 until +2
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Can a 3-point scale also be called a Likert scale?? PS
The Likert type question is used to determine the respondent attitude or feeling on a particular specific item. There are numerous ways to set up the answer types on the Likert scale; see the related links.
The Likert Scale
The correct formula is: 1.5 x (N-1) +1 where N is the score on a 7 point scale.
The correct formula is: 1.5 x (N-1) +1 where N is the score on a 7 point scale.