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.
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Can a 3-point scale also be called a Likert scale?? PS
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' ofStrongly Disagree (-2)Disagree (-1)Neutral (0)Agree (1)Strongly Agree (2)In the above example Likert possible rating is from -2 until +2
The Likert Scale
That depends upon whom you ask, as there is some degree of controversy around Likert scales. Many people, myself included, would consider it interval data, and it is usually interpreted that way. However, there is another school of thought that says that Likert data is ordinal at best. Both sides of the debate have valid points, and this question hasn't been settled.
The correct formula is: 1.5 x (N-1) +1 where N is the score on a 7 point scale.