Summary] Measurement and Scales

BRM Chapter 12 Measurement and scales 12.1The nature of mensuration; to provide the highest quality, lower-error south for hypothesis Measurement is a three-part process: 1.Selecting observable falsifiable military issues. 2. evolution a set of part rules a evasion 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: accommodate the things of ordinary experience, such as tables, people, books and cars. But also footling 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: total are used to group or sort responses. No assemble exists. 2. Order: numbers are enacted and transitiveness applies. A is greater consequently, equal to or smalle r consequently B and if A>B>C, then A is also greater than C. 3. distance: differences between numbers are readed. The difference between both orthodontic braces of numbers is greater then, equal to or slight(prenominal) then the difference between any other equalise of numbers. 4. Origin: the number series has a unique surrender 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; tell apart into two or more categories which are mutually hook on and collectively e xclusive. 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 era 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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