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I always thought your birthday was just whatever day it was but it seems there is way more control than I thought. Some women offered dates for planned c-section may be less likely to choose the 13th of the month, or Friday the 13th. As for the increase in births starts in June July time. I wonder if there is a corresponding increase in prescriptions of antibiotics in the Autumn and start of Winter?
It would be interesting to see the graphic split for planned c-sections, and another for all other births vaginal delivery, emergency c-section, any induction. Something else that might be interesting to know — is there a time of year where it is more likely for IVF embryos to be transferred back and similar other fertility treatment to be carried out?
Being under consultant care it is more likely babies will be born by c-section. I was born on April 1, but it was in , so if they could calculate the birthdays from , that would be great.
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Yes, this is surprising, because with my friends group we hate november because 12 of them of 28 born on those dates. I have thought for some time that low birth rates for major holidays are due to lack of elective c sections. I think doctors and hospital staff would be difficult to arrange for Christmas day, Christmas eve, New year day, independence day.
Would be nice to see the same data set charted to moon phase. And to see if similar trends hold true in other countries. Maybe it is an American quirk to abstain from birth during festive occasions. Great work here and what interesting insights we can get from looking at the data this way.
Any plans to expand to include earlier decades? I wonder how different this map is for firstborn vs others. The ability to control delivery — for the benefit of the physician as well as the parents — has to account for some of the weirder anomalies.
Obviously babies are being pushed off holidays and being done early induction or later C-sections regardless of the conception date no one plans that well! The dearth of births on all of the 13ths of the months is bizarre. Is triskaidekaphobia actually that strong?
Low birth rates on the days around the fourth of july and Christmas and New Years days. This probably reflects low rates of caesarean sections or the preference of obstetricians NOT to operate on those days they have the day off.
This also points to the fact that many caesareans are NOT a medical necessity at the time they are performed. I was supposed to be born on Thanksgiving, so that would have been weird. They argued that thinking about reasons instigates deliberative overriding of implicit self-esteem effects. Jones, Pelham, Mirenberg, and Hetts investigated how the effect held up under so-called 'threats' to the self.
Earlier research by Koole, Smeets, van Knippenberg, and Dijksterhuis had already shown that the name-letter effect is influenced by a perceived threat. What they found was consistent with previous findings: This is predicted by the theory of unconscious self-enhancement.
It can not be explained by mere exposure theory. Nickell, Pederson, and Rossow looked for effects with significant years.
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They asked 83 undergraduate students to rate, on a scale from 1 to 7, how much they liked the years between and , the months of the year, the seasons, times of day, and even types of pet in an attempt to disguise the aim of the study.
Analysis of the data showed that participants liked the year of their birth much more than the average of the four years after they were born. The researchers also found that the year of high school graduation was also liked better than average.
Of the months of the year, the most liked month was the one in which the participants were born. Falk, Heine, Takemura, Zhang and Hsu investigated the validity of implicit self-esteem measures to assess cultural differences. They asked participants from six countries to rate numbers between 1 and They found that in countries where gifts are exchanged on 24 December participants disproportionately preferred the number 24, whereas in countries that do this on 25 December participants preferred In psychological assessments , the birthday-number effect has been exploited to measure implicit self-esteem.
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There is no standard method for applying the task. The most commonly used one is a rating task, which involves having participants judge all the numbers under a certain threshold typically over 31 to mask the purpose of assessing connections to dates , indicating how much they like them on a 7-point rating scale. At least six algorithms are in use.
In their meta-analysis of the name-letter effect, Stieger, Voracek, and Formann recommend using the ipsatized double-correction algorithm.
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Stieger, Voracek, and Formann recommend that the task involve both letter preference and number preference, that it be administered twice, and that the instructions focus on liking rather than attractiveness.
Researchers have looked for wider implications of the birthday-number effect on preferences, both inside and outside the lab. They looked at people who were born on 2 February, 3 March, 4 April, etc.
Simonsohn tried to replicate the finding in different ways but without success. He found no effect of just the day of birthday on the town e. He also found no effect of birthday number on street, address, or apartment number. Jones, Pelham, Carvallo and Mirenberg investigated the influence of number preference on interpersonal attraction.
In a lab study they showed US participants text profiles of people. The profiles came with a prominently displayed, seemingly arbitrary code that was explained as merely to help the researchers keep track of the profiles. One half of the participants were shown a code that matched their birthday e.
All participants were shown exactly the same profile. They had to rate how much they thought they would like the person in the profile. The results showed that participants liked the profiles significantly more when the code matched their own birthday numbers.
They used statewide marriage records to conclude that people disproportionately marry people who share their birthday numbers. Coulter and Grewal investigated if the birthday-number effect could be exploited in sales and marketing.
Over participants of an online survey were asked about an advertisement for a pasta dinner, where the price was secretly matched to the day of the month of their birthday. The researchers found that matching numbers increased price liking and purchase intention. When introducing a perceived threat to the self into the task, they found an exaggerated effect.
They manipulated the prices in advertisements for pizza and a music streaming service to match the birthday day, year of the participants in their lab study. They did not find any disproportionate liking of matching prices, neither for the year the participant was born in or the day. Keller and Gierl concluded that there must be some prerequisites such as priming stimuli to trigger the effect, although they suggested it is possible that their participants, who all happened to have been born between and , saw their birthyear as price so often in real life that it had become too common.
Smeets used name and birthday matching in a product-liking experiment.
He made up product names for a DVD that matched both part of the participant's name and his or her birthday.
He found that high self-esteem participants liked products more if the product names were self-relevant than if they were not.
He also found the opposite happened among low self-esteem participants: From Wikipedia, the free encyclopedia. For yearly variation in mortality rates, see Birthday effect. Bellos' explanation was that in both the East and the West odd numbers tend to have more spiritual significance than even ones.
But as Bosson, Swann, and Pennebaker later argued, this does not control for common preference effects. These people rated him more favourably than the control group. Jiang, Hoegg, Dahl and Chattopadhyay examined the role of a salesperson and a potential customer knowingly sharing a birthday in a sales context.
They found such an incidental similarity can result in a higher intention to purchase. This persuasive effect stems from the need for connectedness. Some participants were led to believe they shared a birthday with the requester, who asked for an overnight critique of an eight-page English paper.
Participants reacted in a heuristic fashion, acting as if they were dealing with a friend. Alex Through the Looking Glass: From Japan to the United States".
Journal of Personality and Social Psychology. The effects of incidental similarity on compliance". Personality and Social Psychology Bulletin.
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As of , Swift had sold over 26 million albums and 75 million digital single downloads worldwide. The Easybeats were widely regarded as the greatest Australian pop band of the s. Moore died on 28th June aged They are one of the world's best-selling bands of all time with worldwide sales of more than 80 million records.
Prior to Foreigner, Jones was in the band Spooky Tooth. Steppenwolf sold over 25 million records worldwide, released eight gold albums and scored 12 Billboard Hot singles. He is a co-founder of the rock band Dire Straits, with whom he spent three years.