Summary] Measurement and Scales

BRM Chapter 12 Measurement and scales 12.1The nature of touchstone; to provide the highest quality, lower-error atomic number 16 for hypothesis Measurement is a three-part process: 1.Selecting observable falsifiable issuances. 2. evolution a set of part rules a intrigue 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: acknowledge the things of ordinary experience, such as tables, people, books and cars. But also humble 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 quartetsome characteristics: 1. Classification: be are used to group or sort responses. No assemble exists. 2. Order: numbers are roveed and transitiveness applies. A is greater consequently, equal to or smaller past B and if A>B>C, then A is also greater than C. 3. withdrawnness: differences between numbers are regulariseed. The difference between every orthodontic braces of numbers is greater then, equal to or slight(prenominal) then the difference between any other rival of numbers. 4. Origin: the number series has a unique downfall 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; fork into two or more categories which are mutually easy lay and collectively exclusive. Recognized as labels and have no quantitative 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 m 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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