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Measurement Scaling Reliability Validity PPT

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CHAPTER 12 : MEASUREMENT: SCALING, RELIABILITY, VALIDITY CONTINUE RATING SCALES  The following rating scales are often used in organizational research.  1. Dichotomous scale  2. Category scale  3. Likert scale  4. Numerical scale  5. Semantic differential scale DICHOTOMOUS SCALE  Is used to elicit a Yes or No answer.  (Note that a nominal scale is used to elicit the response)  Example 4 : Do you own a car?  Yes No CATEGORY SCALE  It uses multiple items to elicit a single response.  Example 5 : Where in Jordan do you reside?  Amman  Mafraq  Irbid  Zarqa  Other LIKERT SCALE  Is designed to examine how strongly subjects agree or disagree with statements on a 5-point scale as following: Strongly Disagree Disagree 1 2 3 Neither Agree Nor Disagree 4 Agree Strongly Agree 5 ______________________________________________________  This is an Interval scale and the differences in responses between any two points on the scale remain the same. SEMANTIC DIFFERENTIAL SCALE  We use this scale when several attributes are identified at the extremes of the scale. For instance, the scale would employ such terms as:  Good – Bad  Strong – Weak  Hot – Cold GOODNESS OF MEASURES GOODNESS OF MEASURES  How can we ensure that the measures developed are reasonably good?  First an item analysis of the responses to the questions tapping the variable is done.  Then the reliability and v ...
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