RM.pptx - Measurement of variables and Scaling The Concept...

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Measurement of variables and Scaling The Concept of Measurement The process of assigning numbers to objects in accordance with specific rules to represent quantities of attributes. Example : Category of Respondents: Male , Female Male : 0 Female : 1 Marital status: Single : 0 Married: 1 Widowed/divorced: 2
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Scales Scale - a measurement tool. Scaling refers to the assignment of numbers (or other symbols) to properties (attributes) of objects in order to impart (apply) some of the characteristics of numbers to the properties in question. In other words, we assign numbers to indicants (or indicators) of the properties (attributes) of objects in order to quantitatively measure those properties. This assignment allows to apply statistical procedures to abstractions (concepts) that would otherwise remain qualitative and therefore unstudied through scientific methods
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Measurement scales Nominal Ordinal Interval and Ratio
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Properties of scales Distinctive classification – measure can used to classify objects or their characteristics into distinctive categories. Eg. Gender – male, female Order – measure is said to have an order if the objects or their characteristics can be arranged in a meaningful order. Eg.marks of a student Equal distance – A measure is said to have equal distance, if the difference between any two consecutive values are equal. Eg. Time difference, 2-3 =3- 4 Fixed origin - A measure is said to have fixed origin, if there is a meaningful zero or absence of the characteristic. Eg. Income of an individual, sales of a company
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Measurement Scales Nominal scale A qualitative scale without an order. This scale can only be categorised and do not satisfy other three properties .Eg Colour preference, type of population Ordinal scale Does not measure values of the characteristics Indicates only the order or rank A qualitative scale with order Possess first two properties of a scale Cannot find out the difference Eg. Rank of students in a class 1,2,3,4, we can’t say that the difference between 1 and 2 is same as that of 3 and 4
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Measurement Scales Interval scale Measure whose successive values represent equal value or amount and whose base value is not fixed A quantitative scale of measure without a true zero Can find out the difference Has the three properties Eg. Temperature - Fahrenheit scale , one can say that an increase in temperature from 10 to 20 0 involves the same increase as in case of from 60 to 70 0, time Ratio scale Quantitative measures with a true zero Has all the four properties Can arrange data in order, can find out difference, and can identify true zero
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  • Fall '19
  • researcher, representative, Level of measurement

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