Validity of Information Display Boards: An Assessment Using Longitudinal Data
作者通过一项持续六周的实验，评估了信息展示板（IDB）方法的有效性。实验让参与者每周从五种健康面包中选择并消费一种，同时用IDB记录其信息获取行为。作者将实际信息获取模式与基于理论和实证的假设对比，发现IDB方法具有合理的构念效度。结果显示，相邻两次选择之间的信息获取量显著下降；第四周引入新品牌并未增加总信息获取量，但搜索行为主要转向新品牌；同样，宣布某面包降价也未增加总信息获取量，但信息获取转向该降价品牌及其他品牌的价格信息。
An experiment was done in which subjects acquired information on, made choices among, and consumed their choices of five health breads once a week for six weeks. Information acquisition was monitored by means of an information display board (IDB). Validity of the method was assessed by comparing actual information acquisition with hypotheses based on theory and/or empirical evidence. This method showed reasonable construct validity. The amount of information acquired declined significantly between each pair of adjoining choice occasions. The introduction of a new brand in the fourth week did not increase total acquisition, but shifted the search primarily to the new brand. Similarly, announcement of a price reduction on one bread did not increase total acquisition, but shifted information acquisition to the reduced-price brand and to the prices of the other brands.