measurement of variable& scaling
TRANSCRIPT
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How are variables measured?Office deskDemographic dataAbsenteeism (decision making when who is
to be fired?)Blood pressure, height, weight.Perception, feelings and attitude
(subjective)
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Operational Definition or Operationalizing the ConceptWay of measuring abstract things to observable
characteristics and behaviour.Concept: ThirstyDrink plenty of fluids
To determine the thirst levels of each individuals by measuring the quantity of fluid they consume to quench their thirst
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Mc Cleland’s theoryNeed of AchievementNeed of PowerNeed of Affiliation
Need of AchievementMeasure?
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What behavioral dimension is observed within people driven by high motivation?
1. Work round the clock or driven by work.2. Unwillingness to relax3. Work on their own4. Challenging job but not too challenging
where probability of success is low5. Progress by getting feedback
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Dimension 1: Work round the clockWorking all the time( number of hours
worker in a day)Persevere even in face of some setbacks( nos. of setbacks experienced in task)Reluctance to take time off ( how frequently
time off and for what reasons)
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Dimension 2: Unwillingness to relaxHow often you think about work when you
are away from workplace?What are your hobbies?How do you spend your time when you are
away from the workplace?
Continuum of who relax very well to who relax very little
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Dimension 3: Work on their own No patience with ineffective people and are
reluctant to work with others
Impatience with ineffectiveness
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Dimension 4: Challenging job but not too challenging Routine or stereotyped job description and
other calling for gradations of challenge built into them
Those to opt for medium degree of challenge would have high achievement orientation
then lower or higher ones
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Dimension 5: Progress by getting feedback
Like feedback from superiors and even subordinates
Appreciate both positive and negative by keeping a track on how often individuals
seek feedback from other during a certain period of time-say a month or more.
Continuum of extensive feedback to no feedback
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1. To what extent you push yourself to get the work done?2. How difficult do you find it to continue in face of failures or discouraging
results?3. How often do you neglect personal matters because you are preoccupied
by your job?4. How frequently you think about ur job when away?5. To what extent you engage in hobbies?6. How disappointed you feel on not reaching goals you had set for
yourself?7. How much do you concentrate on job?8. How annoyed you get when you make mistakes?9. To what extent u refer to work with a friendly but incompetent to one
who’s competent?10. To what extent u prefer to work yourself?11. To what extent you prefer a job that is difficult but challenging than easy
to routine?12. To what degree you prefer extremely difficult assignment to easy one?13. During 3 months, how often have you sought for feedback from
superiors?14. During 3 months, how often have you sought for feedback from
coworkers?15. How often within 3 months you have checked with your subordinates
that what you are doing in not getting in their way of efficient performance/
16. To what extent would it frustrate you if people did not give you feedback on how you are progressing?
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What is operational definition is notNot reasons, antecedents, consequences and
correlatesIt describes observable characteristics
Exercise:Operationalize concept of Learning and Stress
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Scalingthe process or result of observing an event or object in order to determine its extent or quantity by comparison with a known unit and then assigning numbers or any other symbols
to characteristic or feature according to some prespecified formal rules.
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There are four primary scales of measurement are
Nominal (or categorical) scale Ordinal scaleInterval scale Ratio scale
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Nominal Scale
does not express any values or relationships between variables
the only mathematical or statistical operation that can be performed on nominal scales is a frequency run or count
most of the demographic information collected is in the form of nominal scales
categories are mutually exclusive and exhaustive
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ExampleAmericanAustralianChineseGermanIndianEvery respondent has to fit any oneExample 1 Gender – male or femaleExample 2 Do you use Fair and Lovely soap?– yes or noExample 3Are you undergraduate, graduate or post graduate?
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ExerciseSuggest two variables that would be natural
candidates for nominal scales and set up mutually exclusive or collectively exhaustive categories for each.
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Ordinal Scale
categories have a logical or ordered relationship to each other (rank-orders the categories in a meaningful way)permit the measurement of degrees of
difference, but not the specific amount of difference.
only possible to determine whether an object or individual has more or less or equal amount of characteristic in comparison to any other – but NOT what amount of this characteristic
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ExampleExample - Let there be 3 students A, B
and C who respectively received 10, 12 and 20 marks in a test.
The ranks would be – A – 1st B – 2nd C – 3rd
The quantitative (numerical) difference
between 1 and 2 is the same as that between 2 and 3.
But the difference between the ranks, 1st and 2nd is NOT the same as that between 2nd and 3rd.
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ExerciseDevelop an ordinal scale for consumer
preferences for different brands of beer
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Interval Scale
numbers are used to rate and assess objects so that numerically equal distances on the scale represent equal distances in the characteristic being measured
distance between adjacent points on the scale is equal
It helps to compute mean and standard deviation
no true zero in this scale
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ExampleLet there be 4 students A, B, C and D who
respectively received 4, 10, 16 and 20 marks in a test.
Is D doubly brilliant than B?Is A’s brilliance a quarter that of C’s?The quantitative (numerical) difference between
A’s marks and B’s is the same as that between B’s and C’s
The quantitative (numerical) difference between C’s marks and D’s is thrice that between B’s and C’s.
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ExerciseDevelop Achievement motivation on the
interval scale
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Ratio Scale
This scale consists not only of equidistant points but also has a meaningful zero point
most sophisticated of scales, since it incorporates all the properties of nominal, ordinal and interval scales
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Example(1) Temperature measured in degrees Kelvin is a ratio
scale. because absolute zero = meaningful zero point
0° K on the Kelvin scale = – 273.15 °C on the Celsius scale
(2) If we ask 2 respondents their ages, difference between any two years would always be the
same‘zero’ would signify the absence of age or birth Hence, a 100-year old person is indeed twice as old as a
50-year old one. Sales figures, quantities purchased and market share
are all expressed on a ratio scale. (4) most commonly when respondents are asked for their
age, income, years of participation, etc.
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Exercise Mention one variable for each of the four
scales in the context of a market survey and explain how or why it would fit into the scale.
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Rating ScalesDichotomous scale Elicits a Yes or No answer (nominal)Category scale Multiple items to elicit a single response
(nominal)Likert Scale Strong subjects on 5 pt scale SD 1 D2 N3 A4 SA5
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Semantic DifferentialBipolar attributes identified at extremes of the
scale(interval)Responsive__ __ __ __ __ __ __UnresponsiveNumerical 5pt or 7pt scaleExtremely pleased 7 6 5 4 3 2 1Extremly
DispleasedItemized rating scale : 5 or 7 pt scale.
Balanced scale with a neutral point( unlikely & likely)
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Fixed or constant sum scaleChoosing the Toilet soap:1. Fragrance __2. Color __3. Shape __4. Size __5. Texture of Lather _______________________Total Points 100_____________________
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Stapel Scale: Simultaneously measures direction and intensity (interval)
Supervisor attributeThe picture of Sony TV is clear -5 -4 -3 -2 -1 clear +1 +2 +3 +4 +5Graphic Rating ScaleHow would you rate Sony TV on the following
scale?(ordinal)Type I: Extremely bad_________________________Excellent
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Consensus or Thurstone Equal Appearing Interval scale
Multidimensional scaling- conjoint analysis
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Ranking ScalesOrdinal natureThey do not give definitive clues
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Paired comparisonthe respondent is asked to
select one of two items as the preferred or less preferred one according to some criteria.
Example – For each pair of TV indicate which one would you choose for your home viewing
Aiwa Akai LG Samsung
Sony
Aiwa ---
Akai ---
LG ---
Samsung
---
Sony ---
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Forced ChoiceExample – Rank the following brands of TV as
per your preference for home viewing (1 as the best and 5 as the worst).
Aiwa _____Akai _____LG ____Samsung _____Sony ______
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Comparative Scaledeals with direct comparison of objects or
individualsdata collected is interpreted in relative termsdata have only ordinal or ‘rank’
characteristics More Useful About same Less
Useful 1 2 3 4 5
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Many changes continue to occur in the healthcare industry. Because of increased competition for patients among providers and the need to determine how providers can better serve their clientele, hospital administrators sometimes mail a quality satisfaction survey to their patients after patient is released. The following types of questions are sometimes asked on such a survey. The questions will result in what level of data measurement?
1. How long ago you were released from the hospital?2. Which type of unit were you in for most of your stay?_Coronary Care_Intensive Care_Maternity Care3. In choosing hospital, how important was the hospital’s location?Very Important, somewhat important, not very Important, not at all important4. How serious was your condition when you were first admitted to the
hospital?_critical _serious _Moderate _minor5. Rate skill of the doctor:_excellent _very good _good _fair _poor6. Rate one to seven on nursing care poor 1 2 3 4 5 6 7 excellent
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Goodness of Measures Accurately measure Without redundancy Differentiate relevant and irrelevant things
1. Reliability2. Validity
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ReliabilityMeasures without bias, consistent across time
and various items in instrumentTest-retest reliability (across time)Parallel-reliability( changes in wordings and
sequence)Interitem Consistency Reliability (Cronbach’s
Coefficient) Split-half reliability
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ValidityAuthenticity of experimental designCause-effect relationships(internal)Generalizability(external)Content Validity(face validity)Criterion related(Concurrent&
Predictive:difference is clear)Construct Validity(Convergent &
Discriminant)
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Thank you