6. Dennis the Denver dentist and Laura the Louisiana lawyer

데니스Dennis는 덴버Denver의 덴티스트dentist(치과의사)이고, 로라Laura는 루이지애나Louisiana의 로이어lawyer(변호사)다

<논문 내용 요약>

대부분의 사람들이 긍정적인 연상을 자기자신에 대해 가지고 있기 때문에, 대부분의 사람들은 자기와 연결된 것(예를 들어 이름에 있는 글자)을 선호한다. 논문 저자들은 그러한 선호를 암묵적인 자기중심성향(implicit egotism)이라 부른다. 10종의 (심리학) 연구가 암묵적인 자기중심성향의 역할을 평가했는데, 두 가지 중요한 인생문제 의 결정, 즉 사는 곳의 선택과 직업의 선택에 관해서이다.

1~5번 연구는 사람들이 자신들의 이름과 닮은 지역에 사는 경향이 있음을 보여준다.
6번 연구는 생일의 숫자에 대한 선호도 있음을 보여준다.
7~10번 연구는 사람들이 자신들의 이름과 닮은 직업을 선택하는 경향이 있음을 보여준다(예를 들어 데니스Dennis나 데니즈Denise 같은 이름을 지닌 사람은 덴티스트dentist(치과의사) 가운데 더 많이 보인다).
암묵적인 자기중심성향은 중요한 인생문제 결정에 영향을 미치는 것으로 보인다. 이러한 관념은 많은 합리적 선택 모델과 뚜렷하게 대비되며, 암묵적인 믿음에 대한 이해의 중요성을 입증한다.

Dennis the Denver dentist and Laura the Louisiana lawyer

Posted by Andrew on 5 August 2005, 12:35 am

Susan referred me to an article by Brett Pelham, Matthew Mirenberg, and John Jones, called “Why Susie sells seashells by the seashore: implicit egotism and major life decisions.” Here’s the abstract of the paper:

Because most people possess positive associations about themselves, most people prefer things that are connected to the self (e.g., the letters in one’s name). The authors refer to such preferences as implicit egotism. Ten studies assessed the role of implicit egotism in 2 major life decisions: where people choose to live and what people choose to do for a living. Studies 1–5 showed that people are disproportionately likely to live in places whose names resemble their own first or last names (e.g., people named Louis are disproportionately likely to live in St. Louis). Study 6 extended this finding to birthday number preferences. People were disproportionately likely to live in cities whose names began with their birthday numbers (e.g., Two Harbors, MN). Studies 7–10 suggested that people disproportionately choose careers whose labels resemble their names (e.g., people named Dennis or Denise are overrepresented among dentists). Implicit egotism appears to influence major life decisions. This idea stands in sharp contrast to many models of rational choice and attests to the importance of understanding implicit beliefs.
First off, I’m impressed that they did 10 different studies. Psychologists really take their work seriously! Lots of interesting tidbits (see end of this entry for a few).

Some order-of-magnitude calculations

I’d like now to take the next step and estimate the prevalence of this ego-naming phenomenon. Here are the data for female and male dentists and lawyers (for each category, the count (with expected counts, based on independence of the 2-way table, in parentheses):
Den names La names
Female dentists 30 (21.4) 64 (72.6)
Female lawyers 434 (442.6) 1 1512 (1503.4)
Den names La names
Male dentists 247 (229.7) 515 (532.3)
Male lawyers 1565 (1582.3) 3685 (3667.7)
Of the 1576 men in the study with names beginning with “Den,” an extra 17.3 (that’s 247-229.7) became dentists. That would suggest that the name effect changed the career decisions of 17.3/1576=1.1% of these “Den” guys. But that’s an overestimate, since the denominator should be much larger–it should be all the “Den” guys, not just the dentists and lawyers. According to the article, 0.415% of Americans in 1990 were named Dennis. Multiplying by approx 150 million in the labor force yields 620,000 Dennises. Pelham et al. report, “Taken together, the names Jerry and Walter have an average frequency of 0.416%, compared with a frequency of 0.415% for the name Dennis. Thus, if people named Dennis are more likely than people named Jerry or Walter to work as dentists, this would suggest that people named Dennis do, in fact, gravitate toward dentistry. A nationwide search focusing on each of these specific first names revealed 482 dentists named Dennis, 257 dentists named Walter, and 270 dentists named Jerry.” If we assume that 482-(257+270)/2=221 of these Dennises are “extra” dentists–choosing the profession just based on their name–that gives 221/620000= .035% of Dennises choosing their career using this rule.

How to estimate a total effect?

It’s an interesting example of conditional probability. If we accept the basic results of the study–the authors are pretty thorough at handing potential objections–if you meet a dentist named Dennis, it’s quite likely that he picked the profession because of his name. But, an extremely low proportion of Dennises pick a career based on the name. But, then again, there are other D careers. Presumably there are first-letter effects which are weaker than first-3-letter effects, but are still there. So, Dennises could also become doctors, dogcatchers, etc. It would be interesting to set up a simple model and try to estimate the total effect. OK, now some more cool results from the Pelham et al. paper:

. . . whether people named George or Geoffrey (the two most common American first names beginning with Geo) were disproportionately
likely to be published in the geosciences. We did not include
additional names in the list because there simply are no such usable names. We consulted 1990 census data to identify the four European American male first names that were most similar in overall frequency to these two target names (using an expanded version of the procedure described in the supplemental portion of Study 7). The control names for George were Daniel, Kenneth, Donald, and Mark. The control names for Geoffrey were Pete, Randolph, Jonathon, and Bennie. . . . On the basis of the observed frequencies for the eight control names, there should have been 65.5 geoscientists named George or Geoffrey in Study 8. The observed number was 93, or about 42% more than the expected value. Hardware store owners were about 80% more likely to have names beginning with the letter H as compared with R. In contrast, roofers showed the reverse pattern. They were about 70% more likely to have names beginning with R as compared with H. Expected values dictated that 308.8 of the 45,908 women sampled should have resided in cities named after Saints who happened to share their first names. The actual number of women who showed this name–city matching effect was 445, which is 44% greater than the chance value. On the basis of expected values, 3,476.0 out of 594,305 men should have lived in Saint cities bearing their first names. The actual number of men who did so was 3,956, which is 14% greater than the chance value. Just to repeat: this is me quoting the Pelham et al. paper; it’s not my own work.
P.S. See here for more on this matter (including a reference to the paper that shows that people are disproportionately likely to marry others whose surnames begin with the same letter as their own). And here is my calculation that estimates that approximately 1% of Americans’ career choices are influenced by the sound of their first name.

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