Lynn Michael
Ohio State University.
Pers Soc Psychol Bull. 1988 Mar;14(1):87-91. doi: 10.1177/0146167288141009.
Two explanations for the effects of alcohol on prosocial behavior-that is, mood enhancement and cognitive impairment-suggest that restaurant diners should tip more when they have consumed alcohol than when they have not. However, previous attempts to find a relationship between percent tip and alcohol consumption have failed. This failure may be due to statistical problems associated with using percent tip as a measure of tipping. This article reports a study that uses as a dependent variable residuals from a regression of bill size on tip amount. The results of this study indicate that alcohol consumption is positively related to tipping.
关于酒精对亲社会行为（即情绪提升和认知障碍）影响的两种解释表明，餐厅用餐者在饮酒时比不饮酒时应该给更多小费。然而，先前试图找出小费百分比与酒精消费之间关系的尝试均告失败。这种失败可能是由于将小费百分比用作衡量小费的一种方式所带来的统计问题。本文报告了一项研究，该研究将账单金额对小费数额回归的残差用作因变量。这项研究的结果表明，酒精消费与给小费呈正相关。
