SURVEY TIPS WAITRESSES ON WHO TIPS THE MOST CHARLOTTESVILLE, Va., Feb. 21 -- A student research project has confirmed what waitresses have long believed: men are better tippers than women. But here's another tip for waitresses: older men who drink alcoholic beverages, but who do not smoke, and use credit cards to pay for their dinners are the best tippers overall. That's what University of Virginia undergraduate Rebekah Marie Bill found after completing a statistical analysis of how people tip as part of a research project in an econometrics course last semester. In Bill's project three college-age women kept records of their tips over a two-month period, noting such characteristics of their patrons as gender, approximate ages, drinking patterns, smoking behaviors, number at table and method of payment. Tips were recorded for about 300 dinners served at three local establishments: an upscale seafood restaurant, a medium-priced steakhouse chain and a low-priced Mexican restaurant-and-bar near the University. How customers paid for their meals was the most significant factor in determining how much tip was left, the analysis showed. "Cash customers left tips that were 3 percent lower than those who used checks or credit cards. Tips left by credit card users were about 1 percent higher than those paying by check," said Bill, an economics major. Tips left by men were 2.5 percent higher on average than women's tips. Alcohol played a significant factor in tipping decisions. "Tips increased by about 1.5 percent if customers had been drinking," said Bill, who noted that she could find no other study on tipping when she researched her project. Smokers were not so generous. "Holding all other factors constant, smoking negatively affected tips by roughly 1 percent. There was no difference between male and female smokers, " Bill said. The size of the dinner party played a role in determining tips, the analysis showed. "As the size of the group increased, the tip decreased by approximately 1 percent," said Bill, who hopes to find a job in dispute analysis after she graduates in May. A waitress for four years, Bill had expected several factors to be significant that weren't. One surprise was quality of service. "How long customers waited or how much they enjoyed the food did not appear to be a statistically significant determinant of tips," she said. Although there was a general trend that tips were higher with older customers, age was also not statistically significant. When other students in her class elected to examine such things as interest rates for their projects, Bill was not deterred in her choice. "I wanted to choose something I knew about. As a waitress, I can usually guess who is going to tip well. I wanted to see if statistics could help waitresses pick tables offering the highest tip potential." Speaking as an economist, Bill noted, "From the analysis I was able to describe 30 percent of a person's tip. That's impressive because the data does not allow for customer's income, feelings or experiences." Because Bill assigned numbers to each variable and analyzed the factors influencing tipping practices, she believes the results would hold true for diners at similar types of restaurants nationwide. "Most of my chosen variables are universal," she noted. ### February 20, 1996 REPORTERS: To reach Rebekah Bill, contact Ida Lee Wootten at U.Va. News Services, (804) 924-6857.