2.Survey: Measurement and ScalingClassification of Scaling TechniquesRelative Advantages of Comparative ScalesAdvantages: Show
+ small differences between stimulus objects can be detected + same known reference points for all respondents + easy to understand and to use + involve fewer theoretical assumptions + tend to reduce halo or carryover effects from one judgement to another Disadvantages: – have only ordinal and rank-order properties ⟶ limited set of statistical methods available for analysis – data must be interpreted in relative terms – Inability to generalize beyond the set of compared objects Comparative Scales: Paired ComparisonPaired Comparison – Respondent is presented with two objects and asked to select one according to some criterion We are going to present you with ten pairs of beer brands. For each pair, please indicate which one of the two brands of beer you would prefer to purchase. Paired Comparison Scales: ExamplesPaired Comparison: Pros-and-ConsAdvantages: + direct comparison and overt choice + good for blind tests, physical products, and MDS + allows for calculation of percentage of respondents who prefer one stimulus to another + can assess rank-orders of stimuli (under assumption of transitivity) + possible extensions: “no difference” alternative; graded comparison Disadvantages: – # of comparisons grows quicker than # of stimuli (for n objects n(n-1)/2 comparisons) – presentation order bias possible – preference of A over B does not imply subject’s liking of A – little similarity to real choice situation with multiple alternatives – violations of transitivity may occur Ordinal Data: violations of transitivity in paired comparisonOrdinal data: violations of transitivity when aggregating preferencesApple is both the best and the worst alternative. Aggregated preferences of the group are inconsistent! Comparative Scales: Rank Order ScalingRank Order Scaling – Respondents are presented with several objects simultaneously and are asked to order or rank them according to some criterion Rank Oder Scales: ExampleRank Oder Scales: Pros-and-ConsAdvantages: + direct comparison + more realistic than paired comparison
+ good for measuring preferences of brands or attributes; conjoint analysis Disadvantages: – preference of A over B does not imply subject’s liking of A – no zero point / separation between liking and disliking – only ordinal data – violations of transitivity may occur Comparative Scales: Constant Sum ScalingConstant Sum – Respondents allocate a constant sum of units (points, dollars, chips, %) among a set of stimulus objects with respect to some criterion Constant Sum Scaling: Example of AnalysisConstant Sum Scaling: ExampleConstant Sum Scaling: Pros-and-ConsAdvantages: + allows for fine discrimination among stimulus objects without requiring too much time + ratio scaled ⟶ flexible choice of data analysis methods Disadvantages: – results are limited to the context of stimuli scaled, i.e., not generalizable to other stimuli not included in the study – relatively high cognitive burden for respondents, esp. when # of items is large – prone to calc. errors (e.g., allocation of 108 or 94 points) Comparative Scales: Q-Sort Scaling Q-Sort – A rank order procedure in which objects are sorted into piles based on similarity with respect to some criterion. Usually used to discriminate among a relatively large number (60-140) of objects quickly. The number of objects in each pile is limited, usually so that all piles imitate normal distribution. To prevent epidemics, the Ministry of Health has developed the following 25 measures recommended for implementation in hospitals. Please distribute these measures for preventing the spread of infections according to their importance using the scheme below. Please allocate only one measure per box. To the table of contentsWhat are the two types of scaling compare between them?The various types of scales used in marketing research fall into two broad categories: comparative and non comparative. In comparative scaling, the respondent is asked to compare one brand or product against another. With noncomparative scaling respondents need only evaluate a single product or brand.
What are the types of scaling techniques?As mentioned, there are two main types of scaling namely; Rating Scales and Attitude Scales. Researcher need to select one scaling method before development of the survey/ questionnaire.
Are one of two types of scaling techniques in which each stimulus?1) A noncomparative scale is one of two types of scaling techniques in which each stimulus object is scaled independently of the other objects in the stimulus set.
Is a comparative scaling technique in which a respondent is presented with two objects at a time and asked to select one object in the pair according to some criterion?Paired Comparison Scaling
A respondent is presented with two objects and asked to select one according to some criterion. The data obtained are ordinal in nature. Paired comparison scaling is the most widely used comparative scaling technique.
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