Page 50 - Development of Questionnaires for Quantitative Medical Research

published guidelines by reputable institutions

including the World Health Organization (WHO)

(WHO, 2018).

2.3 Questionnaire that is designed to

measure latent variables

The third category of a questionnaire is one which

is designed to measure one or more latent

variables. A latent variable is a variable that is

almost impossible to be measured by using any

machine or device. In other words, the latent

variables are variables inferred from other

variables that can be observed directly (Bollen,