It is made up of 4 or more questions that measure a single attitude or trait when response scores are combined. To use a Likert scale in a survey, you present participants with Likert-type questions or statements, and a continuum of items, usually with 5 or 7 possible responses, to capture their degree of agreement.
To best describe the Likert scale in brief, it's a 5 or 7 point scale that collects qualitative data in the form of options that say“I agree” or “I disagree” and represents these insights as easy to analyze quantitative data reports.
Single, ordinal psychometric scale, allowing original observations to be reproduced.
In the analysis of multivariate observations designed to assess subjects with respect to an attribute, a Guttman scale is a single (unidimensional) ordinal scale for the assessment of the attribute, from which the original observations may be reproduced.
The discovery of a Guttman scale in data depends on their multivariate distribution's conforming to a particular structure.
Hence, a Guttman scale is a hypothesis about the structure of the data, formulated with respect to a specified attribute and a specified population and cannot be constructed for any given set of observations.
Contrary to a widespread belief, a Guttman scale is not limited to dichotomous variables and does not necessarily determine an order among the variables.
But if variables are all dichotomous, the variables are indeed ordered by their sensitivity in recording the assessed attribute, as illustrated by Example 1.
