This is accurate. I was unfortunate enough to have been told the actual day of my conception, and the chart says I should have been conceived just the day before. Given all the variables in play, one day off is incredibly accurate. The data is still somewhat biased because of the irregular sample size. In order to have completely unbiased data you need to have a number of samples such that each day falls on a particular day of the week the same number of times as any other day.
By looking at the graph there are clear spikes on April 4, 11, and We know this is a cause of this bias because:. For example, the day April 11th, from , falls on: Monday 3 times , , Tuesday 3 times , , Wednesday 3 times , , Thursday 3 times , , Friday 3 times , , , Saturday 2 times , Sunday 3 times , , It has more occurrences on a Friday and less occurrences on a Saturday compared to the other days of the week. Because of other studies showing that weekend birthdays are less common than weekday ones, we can conclude that the lowered frequency of weekend dates for the days April 4, 11, and 18 are causing a spike.
In order to have unbiased data you need a sample size of a year span e. My birthday is the rarest by far. Interesting seeing the slump around Christmas. I wonder if Christmas babies were as rare in the past as they are now? Is that controlled for somewhere to normalize that date against the others? Far fewer people are born on February 29 than on any other date, so I presume some kind of statistical adjustment has been made.
I always tell people that I almost never meet anyone who shares my birthday, November I should either 1 exclude it or 2 do a weighted average. Thanks for prompting me to check it out.
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Weighted average gets my vote, excluding it seems a bit harsh for those people born on those days. I just gave birth to my daughter on November 23rd Black Friday this year. We were induced for preeclampsia and were not due until January 31st.
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I also notice the 13th of every month is low. I always thought your birthday was just whatever day it was but it seems there is way more control than I thought. I had a classmate whose sister was born on September 11, More details here:. 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?
Calculating the Birthday Number
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. Yes, this is surprising, because with my friends group we hate november because 12 of them of 28 born on those dates. Five on 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. That seems obvious!
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. I should be finished soon if you want to check it out:. Love this! 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.
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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! While Christmas is the celebration of Christ's Birth, some religious groups see it as being portrayed in a negative light. Some Muslim especially from Salafi school of thought  oppose the celebration of a birthday as a sin, as it is considered an "innovation" of the faith, or bi'dah while other clerics have issued statements saying that the celebration of a birthday is permissible.
Some Muslims migrating to the United States adopt the custom of celebrating birthdays, especially for children, but others resist. There is also a great deal of controversy regarding celebrating Mawlid the anniversary of the birth of Muhammad. While a section of Islam strongly favours it,  others decry such celebrations, terming them as out of the scope of Islam. That age is reckoned whenever Janma Nakshatra of the same month passes. Hindus regard death to be more auspicious than birth since the person is liberated from the bondages of material society.
Many monasteries celebrate the anniversary of Buddha's birth, usually in a highly formal, ritualized manner. They treat Buddha's statue as if it was Buddha himself, as if he were alive; bathing, and "feeding" him. Sikhs celebrate the anniversary of the birth of Guru Nanak. In North Korea , people do not celebrate birthdays on July 8 and December 17 because these were the dates of the deaths of Kim Il-sung and Kim Jong-il , respectively. More than , North Koreans celebrate displaced birthdays on July 9 or December 18 to avoid these dates.
A person born on July 8 before may change their birthday, with official recognition. From Wikipedia, the free encyclopedia.autodiscover.manualcoursemarket.com/76.php
How the day of the month you are born defines your personality | Daily Mail Online
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Retrieved on Statistics New Zealand. Retrieved 2 October The New York Times. Retrieved 21 November Retrieved Classical Antiquity. Origins of Chinese People and Customs p. Asiapac Books Singapore. Just Asked. Archived from the original on Flatbush Jewish Journal. Birthdays also have a long-standing and an intimate link with astrology and the horoscope. These were humble, modest men and women who did not view their arrival in the world as so important that it should be celebrated.
Micah ; Luke Rather, they glorified Jehovah and thanked him for the precious gift of life. July 8, , p. For example, their views definitely put birthday celebrations in a bad light. Faragallah, Walter R. Schumm and Farrell J. Webb Journal of Comparative Family Studies. USA Today. Retrieved 6 April North Korea celebrates Kim Jong Il's legacy". Retrieved 21 April Categories : Birthdays.
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