29 Chapter 2 Dependent variables. Impulse-buying urge was measured using a threeitem scale (explained variance = 76.26%, Cronbach’s alpha = .84). Two of the items were based on a scale used by Sultan et al. (2012), namely, ‘I feel a strong urge to buy (one of) the products that the screen displayed’ and ‘I want (one of the) products that the screen displayed.’ The third item was added validate the definition of impulse buying, where unplanned needs play an important role: ‘I did not intend to buy (one of) the displayed products, but I now have the desire to do so.’ We could not find an existing scale that measures impulse-visit urges. Therefore, we adjusted the scale we used to measure impulse-buying urges as follows: ‘I feel a strong urge to enter this store,’ ‘I want to visit this store,’ ‘I did not intend to visit this store, but now I do feel the desire to do so’ (explained variance = 80.24%, Cronbach’s alpha = .88). Mediator. Self-agency was measured using the items ‘It felt like I was responsible for what happened on the screen’ and ‘It felt like I was the one influencing what happened on the screen,’ based on a scale by Ruth et al. (2002) (explained variance = 90.01%, Cronbach’s alpha = .96). See Table 2 for an overview of all key measurements that were used per experiment. Table 2: Measurements key-constructs Experiments 1, 2a, and 2b. Impulsebuying urge Impulsevisit urge Feelings of self-agency Construct Items Explained variance 1/2a/2b Cronbach’s Alpha 1/2a/2b Based on scales used by: I feel a strong urge to buy (one of the) products that the screen displayed; I want (one of the) products that the screen displayed; I did not intend to buy (one of the) displayed products, but now I do feel the desire to do so. I feel a strong urge to enter this store; I want to visit this store; I did not intent to visit this store, but now I feel the desire to do so. It felt like I was responsible for what happened on the screen; It felt like I was the one influencing what happened on the screen. 76.26%/ 70.23%/ 74.01% .84/.79/.82 Sultan et al., (2012). Sultan et al., (2012). Ruth et al., (2002). 80.24%/ 73.40%/ 73.62% 88/.82/.82 90.01%/ 95.32%/ 87.79% .96/.91/.86 * Item was recoded in the analysis
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