Level of Measurement: It provides a classification used to describe the nature of the information contained within the variable. The classification level of the variable will determine the types of calculations that can be performed using the variable.
Nominal Scale: The level of measurement involving numeric or alphanumeric responses which can be grouped. But the groups are distint and cannot be compared. Eg. Red, Green, Yellow, Male, Female
Ordinal Scale: The level of measurement involving numeric or alphanumeric responses which can be grouped. But the groups can be arranged in an order. In other words, the distance between the numeric responses is fixed but meaningless. Eg. Rating, Ranking
Interval Scale: The level of measurement involving numeric responses with decimal point. In other words, the distance between the responses is not fixed but meaningful. Eg. Temperature.
Ratio Scale: The level of measurement involving numeric responses with absolute zero. In other words, the responses represent intervals but are not expressed below the zero value. Eg. Height, Weight, Coverage value in Market Research.
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