Glossaire de termes statistiques : Définition Rating scale

A rating scale is used to record rank-based statements of respondents in a survey. Often, rating scales are composed of steps 1 to 7, but generally the number of steps can vary. Usually, we label the two ends of a scale with descriptions such as "1: I'm very interested" to "7: I'm not interested at all". Alternatively, all the steps of a scale are labeled; this is not essential, though. When looking at rating scales with an uneven number of steps, the mean value usually represents the answer "do not know/undecided".

Strictly speaking, most rating scales are ordinal scales. The intervals between the individual steps are not always the same size. It is not unusual in statistics, however, to define these rating scales as interval scales anyway. Same-sized intervals between individual steps are assumed; therefore a mean is sometimes defined for rating scales as well.  

Les définitions de notre encyclopédie sont des explications simplifiées de termes. Notre but est de rendre ces définitions compréhensibles pour un large public. Par conséquent, il est possible que certaines d’entre elles ne soient pas entièrement à la hauteur des standards scientifiques.

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