Summary] Measurement and Scales

BRM Chapter 12 Measurement and scales 12.1The nature of mensuration; to provide the highest quality, lower-error sulfur for hypothesis Measurement is a three-part process: 1.Selecting observable observational facts. 2. evolution a set of part rules a organization for designate metrical composition or symbols to represent aspects of the event being measured. 3.Applying the mapping rule(s) to each observation of that event. What is measured? Objects: let in the things of ordinary experience, such as tables, people, books and cars. But also itty-bitty concrete things, the likes of attitudes, opinions and peer-group pressures. Properties: the characteristics of the objects (height, weight, posture). 12.2Data types Mapping rules have quadruplesome characteristics: 1. Classification: add up are used to group or sort responses. No assemble exists. 2. Order: numbers are prescribeed and transitivity applies. A is greater consequently, equal to or smalle r and so B and if A>B>C, then A is also greater than C. 3. farness: differences between numbers are stateed. The difference between all orthodontic braces of numbers is greater then, equal to or less(prenominal)(prenominal) then the difference between any other span of numbers. 4. Origin: the number series has a unique pedigree indicated by the number zero.

Combinations of these characteristics of classification, order, distance and origin provide four widely used classification of measurement scales: 1. Nominal; single out into two or more categories which are mutually scoopful and collectively exc lusive. Recognized as labels and have no q! uantitative value (frequency distribution). 2. Ordinal; nominal data plus an order? the transitivity postulate needs to be fulfilled (greater than, equal, less than, without showing how much) 3. Interval; incorporate the concept of equality of clip interval (calendar time, time and temperature). 4. Ratio; an absolute zero of origin. 12.3Sources of measurement differences Errors in measurements: 1. Participant. Boredom, fatigue, reluctant...If you want to get a full essay, order it on our website: BestEssayCheap.com

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