Chapter 19Scale formationScale reliability analysis and exploratory factor analysis
Background
Rationale
Two major reasons for using scales are that it makes further analysis easier and reduces the risk of Type I errors. Collected data items, such as Likert response values (Trochim, 2021a) from a questionnaire, are often of ordinal data type, whereas derived scales are numerical data. This means there are more and better analysis techniques which can be used with scales. Another reason for using scales is that they provide more reliable measures than individual items.
Creating trial items
When designing one or more scales for a psychological construct from scratch, it is advisable to start with ...
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