Page 94 - Development of Questionnaires for Quantitative Medical Research
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● Ratio
Ratio scale is similar to interval scale, except that
it has a true zero which indicates a complete
absence of the item on the measurement scale.
Examples of ratio scales are height, weight and
money. A reading of zero in height scale indicates
non-existence. Ratio scale also provides
information about the relative magnitude of
scores. For instance, it can be interpreted that 20kg
is twice as heavy as 10kg. Based on Figure 3.5, all
the six questions require responses to be expressed
in the ratio form. However, the ratio scale does not
need any coding unlike nominal, ordinal and
