Measurement Scales Measurement Scales Measurement : Assignment of numbers Measurement : Assignment of numbers or or symbols symbols to to Characteristics of objects Characteristics of objects Example: Consumers’ Perception Example: Consumers’ Perception Attitude Attitude Preferences Preferences It is like a mapping; It is like a mapping; Characteristics Numbers 1,2,3…..
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Measurement ScalesMeasurement Scales Measurement : Assignment of Measurement : Assignment of
numbers or numbers or symbols tosymbols to
Characteristics of objectsCharacteristics of objects Example: Consumers’ PerceptionExample: Consumers’ Perception
AttitudeAttitude Preferences Preferences
It is like a mapping; It is like a mapping; Characteristics
Numbers1,2,3…..
Scaling Scaling is extension of ‘ Measurement ’Scaling is extension of ‘ Measurement ’ Scaling is creating a range or continuum Scaling is creating a range or continuum
on which measured objectives are located.on which measured objectives are located. Example: Measurement of attitude : Example: Measurement of attitude :
favorable or unfavorable favorable or unfavorable Scaling creates four levels:Scaling creates four levels:
– Very favorable, favorable, Unfavorable, Very Very favorable, favorable, Unfavorable, Very unfavorable.unfavorable.
Measurement assigns the number: 4,3,2,1Measurement assigns the number: 4,3,2,1
ComparisonComparison Interval : Y= a + b XInterval : Y= a + b X
– Here difference between two measurement Here difference between two measurement is equal, the ratio is not equalis equal, the ratio is not equal
Example:Example:
Very good Good Poor Very PoorVery good Good Poor Very Poor Scale A 4 3 2 1Scale A 4 3 2 1 Scale B 2 1 0 -- 1Scale B 2 1 0 -- 1
Ratio of Very good to good is 4/3=1.33 in scale A ,while the Ratio of Very good to good is 4/3=1.33 in scale A ,while the same is 2/1=2.0 in scale B.same is 2/1=2.0 in scale B.
Difference is equal Difference is equal
Ratio : Y= b XRatio : Y= b X
Assigning scores to interval Scale Assigning scores to interval Scale
A five point interval scale could be as A five point interval scale could be as follows:follows:– Very happyVery happy– HappyHappy– Neither happy nor unhappyNeither happy nor unhappy– UnhappyUnhappy– Very unhappyVery unhappy
Now the question is what numerical scores Now the question is what numerical scores could be assigned to the five categories ?could be assigned to the five categories ?
Does it Does it really matter ? matter ?
Measurement ScalesMeasurement Scales
What measurement scale will you use for What measurement scale will you use for the following?the following?– Do you own a washing machine?Do you own a washing machine?– What is your marital status ?What is your marital status ?– How many books are there in your library?How many books are there in your library?– How satisfactory is bank’s service?How satisfactory is bank’s service?– Describe your preference for brands of Describe your preference for brands of
shampoo?shampoo?– Your attendance in the Business Research Your attendance in the Business Research
class ?class ?– How many members watch DD-1 during the How many members watch DD-1 during the
prime time in your household?prime time in your household?
Scaling TechniquesScaling Techniques
Non-comparativeNon-comparativeScalesScales
Comparative Comparative ScalesScales
Paired Paired ComparisonComparison
Rank Rank OrderOrder
Constant Constant SumSum
Q-Sort and Q-Sort and Other Other ProceduresProcedures
A Classification of Scaling TechniquesA Classification of Scaling Techniques
Scaling Techniques: Attitude and Rating scales Scaling Techniques: Attitude and Rating scales
Scaling
ComparativeMonadic
OrNon-Comparative
Scaling Techniques: Attitude and Rating scalesScaling Techniques: Attitude and Rating scales
Comparative
Pairedcomparison
Rank
OrderConstant
SumQ- Sort
Attitude and Rating scales:Attitude and Rating scales:
COMPARATIVECOMPARATIVE– Paired comparison Paired comparison : here : here two objects at a time two objects at a time are are
taken and better one is identifiedtaken and better one is identified– Rank OrderRank Order: according to specified ( or unspecified i.e. : according to specified ( or unspecified i.e.
overall )criterion the ranking is doneoverall )criterion the ranking is done– Constant sumConstant sum: Usually 10 ( or 100) points are : Usually 10 ( or 100) points are
distributed among the objects to reflect the differences distributed among the objects to reflect the differences and gapsand gaps
– Q-SortQ-Sort (or Ordered Category sorting): ranks are given to (or Ordered Category sorting): ranks are given to groups of objects, differences are indicated among groups of objects, differences are indicated among groups .groups .
– Indexing or magnitude estimationIndexing or magnitude estimation: the ‘best’ object is : the ‘best’ object is given a score of 100, others are rated as per this given a score of 100, others are rated as per this comparisoncomparison
– FractionationFractionation: Here the best object is rated as 1, others : Here the best object is rated as 1, others as fractions of 1as fractions of 1
NON -COMPARATIVENON -COMPARATIVE
Obtaining Shampoo Preferences Using Obtaining Shampoo Preferences Using Paired ComparisonsPaired Comparisons
Instructions: We are going to present you with ten pairs of shampoo brands. For each pair, please indicate which one of the two brands of shampoo you would prefer for personal use. Recording Form:
SunSilk Finesse Clinic Head & Shoulders
Pert
Sunsilk - 0 0 1 0 Finesse 1a - 0 1 0
Clinic 1 1 - 1 1
Head & Shoulders 0 0 0 - 0 Pert 1 1 0 1
Number of Times Preferredb
3 2 0 4 1
aA 1 in a particular box means that the brand in that column was preferred over the brand in the corresponding row. A 0 means that the row brand was preferred over the column brand. bThe number of times a brand was preferred is obtained by summing the 1s in each column.
Paired Comparison AnalysisPaired Comparison AnalysisSuppose 100 consumers compare five tyre brands as follows:Suppose 100 consumers compare five tyre brands as follows:
All the frequencies shown in the previous table are divided All the frequencies shown in the previous table are divided from the total number of respondents( 100 here).from the total number of respondents( 100 here).
Write z-scores: This table presents z values corresponding to Write z-scores: This table presents z values corresponding to percentage points departure from 0.5 percentage points departure from 0.5
( Ex Modi-Dunlop : 0.84 is z value for an area of 0.30)( Ex Modi-Dunlop : 0.84 is z value for an area of 0.30)
Paired Comparison ScalingPaired Comparison ScalingThe most common method of taste testing is paired comparison. The consumer is asked to sample two different products and select the one with the most appealing taste. The test is done in private and a minimum of 1,000 responses is considered an adequate sample. A blind taste test for a soft drink, where imagery, self-perception and brand reputation are very important factors in the consumer’s purchasing decision, may not be a good indicator of performance in the marketplace. The introduction of New Coke illustrates this point. New Coke was heavily favored in blind paired comparison taste tests, but its introduction was less than successful, because image plays a major role in the purchase of Coke.
A paired comparison taste test
Other issues related to rankingOther issues related to ranking
A A ranking-grid is always ranking-grid is always better than simple better than simple rankingranking
In a grid , a frequency table is prepared for In a grid , a frequency table is prepared for all objects ranked all objects ranked
Only ‘top’ Only ‘top’ ranking will lead to partial ranking will lead to partial picture onlypicture only
An analysis of ‘first two’ is more explicitAn analysis of ‘first two’ is more explicit Similarly an analysis of ‘first three’ I even Similarly an analysis of ‘first three’ I even
betterbetter
Example: if a question “ Which colour do you Example: if a question “ Which colour do you prefer?” is asked of ( say) 100 respondents. The first prefer?” is asked of ( say) 100 respondents. The first preference response may be :preference response may be :
Red 45 , Blue 44 , Yellow 11Red 45 , Blue 44 , Yellow 11 Then the ranking is 1.Red, 2.Blue, 3. YellowThen the ranking is 1.Red, 2.Blue, 3. Yellow Let us look at the complete picture ( frequency of Let us look at the complete picture ( frequency of
respondents)respondents) Rank I Rank II Rank IIIRank I Rank II Rank III RED 45RED 45 66 4949 BLUE 44BLUE 44 5454 0202 YellowYellow 11 11 4040 4949 Let us now introduce a score of 3 for Rank I. score Let us now introduce a score of 3 for Rank I. score
of 2 for rank II and a score of 1 for rank IIIof 2 for rank II and a score of 1 for rank III When only First preference is taken , It is Red, Blue, When only First preference is taken , It is Red, Blue,
YellowYellow
When three preferences are taken Blue ( 2.42), Red When three preferences are taken Blue ( 2.42), Red ( 1.96).and Yellow( 1.62)( 1.96).and Yellow( 1.62)
See the difference?See the difference?
Preference for Toothpaste Brands Preference for Toothpaste Brands Using Rank Order ScalingUsing Rank Order Scaling
Instructions: Instructions: Rank the various brands of toothpaste in order of Rank the various brands of toothpaste in order of preference. Begin by picking out the one brand that you like most preference. Begin by picking out the one brand that you like most and assign it a number 1. Then find the second most preferred and assign it a number 1. Then find the second most preferred brand and assign it a number 2. Continue this procedure until you brand and assign it a number 2. Continue this procedure until you have ranked all the brands of toothpaste in order of preference. have ranked all the brands of toothpaste in order of preference. The least preferred brand should be assigned a rank of 10. The least preferred brand should be assigned a rank of 10.
No two brands should receive the same rank number.No two brands should receive the same rank number.
The criterion of preference is entirely up to you. There is no right The criterion of preference is entirely up to you. There is no right or wrong answer. Just try to be consistent.or wrong answer. Just try to be consistent.
BrandBrand Rank OrderRank Order
1. Crest1. Crest __________________
2. Colgate2. Colgate __________________
3. Aim3. Aim __________________
4. Anchor4. Anchor _________ _________
5. Macleans5. Macleans __________________
6. Ultra Brite6. Ultra Brite _________ _________
7. Close Up7. Close Up _________ _________
8. Pepsodent8. Pepsodent _________ _________
9. Plus White9. Plus White _________ _________
10. Forhans10. Forhans _________ _________
Importance of Bathing Soap Attributes Using a Constant Importance of Bathing Soap Attributes Using a Constant Sum ScaleSum Scale
Constant Sum Scale Constant Sum Scale
On the next slide, there are eight attributes of bathing soaps. Please allocate 100 points among the attributes so that your allocation reflects the relative importance you attach to each attribute. The more points an attribute receives, the more important the attribute is. If an attribute is not at all important, assign it zero points. If an attribute is twice as important as some other attribute, it should receive twice as many points.
Form Average Responses of Three Segments Attribute Segment I Segment II Segment III
Scaling Techniques: Attitude and Rating scalesScaling Techniques: Attitude and Rating scales
Non Comparative or Monadic
ContinuousRating Scales
ItemizedRating Scales
LikertType
Semantic Differential
Staple
Pictorial
Attitude and Rating scalesAttitude and Rating scales
Graphic or Continuous Scales – Poles ( extreme points) are defined
Pictorial Scales– Different measurements are expressed
with pictures/ line-drawings/ other forms Itemized Scales (also known as Discrete)
– Several categories defined– All categories may or may not be
numbered– Some times only extreme points are
numbered– ( variations are used depending on the
variables, respondents)
Attitude and Rating scalesAttitude and Rating scales
Considerations in developing a scale Number of categories
More or Less Where to stop ( maximum no. of
categories) Balanced /Unbalanced Odd or Even number of categories Neutral Point ( forced / Non-forced)
Genuine neutral point or Escape route for the respondents
Attitude and Rating scalesAttitude and Rating scales
Advantage & disadvantage Graphic :
+ Easy to explain, Maximum flexibility + Easy to explain, Maximum flexibility _Difficult to measure ( requires computerized / _Difficult to measure ( requires computerized /
magnetic recognition readers) magnetic recognition readers) _ Subjective interpretation of middle points _ Subjective interpretation of middle points
Itemized or Discrete / Marked + Easy to explain to the respondent+ Easy to explain to the respondent + works well with ‘ limited ’ categories+ works well with ‘ limited ’ categories + Easy to analyze+ Easy to analyze _ Difficult with ‘ many’ categories_ Difficult with ‘ many’ categories Verbal expression should be distinguishableVerbal expression should be distinguishable
Pictorial + Best for children/ respondents with less education+ Best for children/ respondents with less education
Thermometer ScaleInstructions: Please indicate how much you like McDonald’s hamburgers by coloring in the thermometer. Start at the bottom and color up to the temperature
level that best indicates how strong your preference is.
Form:
Smiling Face Scale Instructions: Please point to the face that shows how much you like the Barbie Doll. If you do not like the Barbie Doll at all, you would point to Face 1. If you liked it very much, you would point to Face 5.
Form:
1 2 3 4 5
Some Pictorial Rating Scale ConfigurationsSome Pictorial Rating Scale Configurations
Like very much
Dislike very much
100 100 75 75 50 50 25 25 00
Attitude and Rating scalesAttitude and Rating scales
Can the Monadic ( non-comparative Can the Monadic ( non-comparative scale be used for comparison)?scale be used for comparison)?
How?How? Example ?Example ?
1) Number of categories Although there is no single, optimal number, traditional guidelines suggest that there should
be between five and nine categories 2) Balanced vs. unbalanced In general, the scale should be balanced to obtain
objective data 3) Odd/ even no. of categories If a neutral or indifferent scale response is possible
from at least some of the respondents, an odd number of categories should be used
4) Forced vs. non-forced In situations where the respondents are expected to have no opinion, the accuracy of the data may be improved by a non-forced scale
5) Verbal description An argument can be made for labeling all or many scale categories. The category descriptions should be located as close to the response categories as possible
6) 6) Physical formPhysical form A number of options should be tried and the best selected
Summary of Itemized Scale DecisionsSummary of Itemized Scale Decisions
Attitude and Rating scales:Attitude and Rating scales:Some standard ScalesSome standard Scales
Thurstone: – Agreement /Disagreement on a large
number of statements ( usually 11)– Time consuming , Tiring, dissuading ,– Long process of identifying
Likert:– Five point( usually)– Levels of Agreement /Disagreement– Easy to explain /develop
Attitude and Rating scalesAttitude and Rating scales
Stapel:– Unipolar,10 point interval, rating from
+5 to -5– Balanced without neutral point
Semantic Differential– ( usually) 7 point scale– Bi polar, with a neutral point,– rating +3 to -3
Summative scale– Attitude /Dimension to be used is divided into
several statements and Likert scale of 5 points ( or 4/6/7 etc.) to be used for every statement.
– The scores of each statement are then summed up to measure the total score on that dimension
– Example: to measure brand loyalty of consumers or organizational commitment of employees
Loyalty:Loyalty:
I always use this brandI always use this brand Strongly Strongly Agree Agree
55
AgreeAgree
44
Cant Cant say say
33
DisDis
Agree Agree
22
Strongly Strongly disagreedisagree
11
I am willing to pay more for I am willing to pay more for this brandthis brand
I will postpone the purchase I will postpone the purchase if this brand was not if this brand was not availableavailable
………………....
…………....
Balanced ScoresBalanced Scores To make a comparison between two To make a comparison between two
A Semantic Differential Scale for Measuring Self- A Semantic Differential Scale for Measuring Self- Concepts, Person Concepts, and Product ConceptsConcepts, Person Concepts, and Product Concepts
Jovan Musk for Men is Jovan Musk for Men is Extremely goodExtremely good Extremely good Extremely good Very goodVery good Very good Very good GoodGood GoodGood Bad Bad Somewhat goodSomewhat goodVery bad Very bad Bad Bad Extremely badExtremely bad Very badVery bad
Balanced and Unbalanced ScalesBalanced and Unbalanced Scales
A variety of scale configurations may be employed to measure the gentleness of Cheer detergent. Some examples include: Cheer detergent is: 1) Very harsh --- --- --- --- --- --- --- Very gentle
2) Very harsh 1 2 3 4 5 6 7 Very gentle
3) . Very harsh . . . Neither harsh nor gentle . . . Very gentle 4) ____ ____ ____ ____ ____ ____ ____ Very Somewhat Neither harsh Somewhat Gentle Very harsh Harsh harsh nor gentle gentle gentle
5) Very Neither harsh Very harsh nor gentle gentle