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Measurement level scale can be of four types: nominal, ordinal, interval and proportional. According to the method of preparation of the scale are divided into compiled by method of judgment (L Thurston), total ratings (Likert L.) and analysis of scalogram (L. Guttman).In principle, all or almost all alternative questions can be represented in a timeline, assigning each of them a score, or rank, and thus organize them in a meaningful value. But depending on the subject matter and nature of the recorded information are different types of scales. The essence of each type scales (marked in three types: nominal, ranked (ordinal) and interval) successfully showed Vladimir Levashov and G. Papoyan in this example."At the dawn of human history as the only source of temperature measurement was made by an individual feeling. Based on the subjective feeling of the majority, it was possible to make an alternative conclusion: it is warm or cold. This conclusion is unrelated to the specific value of temperature. Such a measurement is called a measurement in nominal scale. With the development of observation, people learned to measure, comparing the object with a strictly constant or recurrent phenomenon. For example, for measuring the temperature of such a phenomenon could be the physical state of water in the nature: ice - water - steam. Here we have an ordered (ranked) dimension: cold - warm - hot, though the numeric values yet also absent. This measurement is carried out according to the rank scale". The nominal scale. Each item of the scale exists as it is in itself, and in General the scale is not ordered. The only condition is that all elements must have a common basis for allocation.
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