5.3.1 Limitations First, in all of the models that where ran in this research a lot of unexplained variance still existed meaning that the purchasing process of customers is far more complex than just looking at whether there was employee-customer interaction or even by looking at the timing of the approach. The actual purchase decision of a customer is a result of a complex psychological and behavioral process that possibly can never be fully explained. Second, this research is written under the assumption that the effect of irritation and intrusiveness is causing customers to deflect when they are approached too early and are interrupted in achieving their shopping goals within their shopping trip. However there could very well be other reasons than the feelings of irritation and intrusiveness causing these customers to deflect. In the field of advertising for instance the ‘liking’ and the ‘effectiveness’ are said to be two completely different things meaning that a disliked advertisement does not necessarily mean it is not effective and vice versa (Greyser 1973), and that no firm conclusions should be made about the effectiveness of advertisements because it is argued that they can still be effective despite the irritation it causes (Aaker and Bruzzone 1985). A better understanding of the psychological and behavioral process underlying the reduction in purchasing likelihood due to an early approach could therefore benefit from different types of data and approaches, for example self-stated data through questionnaires and/or lab and field experiments. Third, the results of model 2a might be slightly biased. Model 2a provided some alarming values for parameters that might indicate a biased model in terms of multicollinearity. Therefore, the results of this model, producing the inverted U-curve, should be interpreted with care. Fourth, this research is based on observations gathered by tracking the radio frequencies of customers’ mobile phones. Customers without mobile phones, typically a very small fraction of the population, are therefore not observed. Fifth, this thesis is written under the assumption that all customers and therefore all customer segments react in the same manner in respect to approach timing.
5.3.1 Limitations First, in all of the models that where ran in this research a lot of unexplained variance still existed meaning that the purchasing process of customers is far more complex than just looking at whether there was employee-customer interaction or even by looking at the timing of the approach. The actual purchase decision of a customer is a result of a complex psychological and behavioral process that possibly can never be fully explained. Second, this research is written under the assumption that the effect of irritation and intrusiveness is causing customers to deflect when they are approached too early and are interrupted in achieving their shopping goals within their shopping trip. However there could very well be other reasons than the feelings of irritation and intrusiveness causing these customers to deflect. In the field of advertising for instance the ‘liking’ and the ‘effectiveness’ are said to be two completely different things meaning that a disliked advertisement does not necessarily mean it is not effective and vice versa (Greyser 1973), and that no firm conclusions should be made about the effectiveness of advertisements because it is argued that they can still be effective despite the irritation it causes (Aaker and Bruzzone 1985). A better understanding of the psychological and behavioral process underlying the reduction in purchasing likelihood due to an early approach could therefore benefit from different types of data and approaches, for example self-stated data through questionnaires and/or lab and field experiments. Third, the results of model 2a might be slightly biased. Model 2a provided some alarming values for parameters that might indicate a biased model in terms of multicollinearity. Therefore, the results of this model, producing the inverted U-curve, should be interpreted with care. Fourth, this research is based on observations gathered by tracking the radio frequencies of customers’ mobile phones. Customers without mobile phones, typically a very small fraction of the population, are therefore not observed. Fifth, this thesis is written under the assumption that all customers and therefore all customer segments react in the same manner in respect to approach timing.
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