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The sample dimension, types of variables, format used for measurement, and construction of instruments to collect valid and reliable data must be considered during the research process. In the social and health sciences, and more specifically in nursing, data-collection instruments are usually composed of latent variables or variables that cannot be directly observed. Such facts emphasize the importance of deciding how to measure study variables (using an ordinal scale or a Likert ordoi:10.1590/s0080-623420140000100019 pmid:24676121 fatcat:xd4ibr6b45dgpc2o4mmpougpo4