De Econometrist neemt een statistische kijk op de wereld.
Google is known as the king of riddle recruitment and its insanely difficult puzzles often go viral online. Large companies use these recruitment puzzles to narrow down a huge graduate applicant pool to a select few. A coder googled the words “python lambda function list comprehension” and got “You’re speaking our language. Up for a challenge?” as an answer from the search engine. After the coder solved the “100 hats riddle”, he was offered a job at the tech powerhouse. The “100 hats riddle” There are 100 prisoners lined up by an executioner and they […]
It is almost that time of the year again: 5 December. In the Netherlands we also call it ‘pakjesavond’. Especially the children look forward to it throughout the whole year. A well known tradition around this time of the year is drawing lots: everybody gets a lot with the name of somebody else and you should buy a gift and write a poem for that person. An often encountered problem is that you do not draw another person but that you draw yourself. But how likely is it that this will happen? When I […]
Tot de verrassing van velen komt Facebook in het komende jaar met zijn eigen cryptocurrency. Helemaal na verschillende schandalen in de behandeling van persoonlijke data. Toch wordt verwacht dat Libra zal uitkomen in de eerste helft van komend jaar. Wat is de huidige stand van zaken, en gaat dit onze euro vervangen? Als alles volgens plan gaat, moet het mogelijk zijn om met deze valuta te kunnen betalen in verschillende apps van Facebook zoals Whatsapp, Messenger en Instagram. Ook wordt het mogelijk voor 3e partijen om deze mogelijkheid te integreren in hun apps. Libra is, […]
In the movie ‘The Butterfly Effect’ a college student, Evan Treborn, finds a way to ‘travel back in time’. He does this by inhabiting his former self, that is, his adult mind inhabits his younger body. In this way, he can change the present by changing his past behaviours. Unfortunately, this has unintended consequences for him and his friends. It is not a coincidence that this movie is called ‘The Butterfly Effect’. The movie is named after the mathematical idea that is also called the Butterfly Effect, which is based on the phenomenon that the […]
Nowhere else in the world, is there such a high percentage of people using the bicycle for transport as in Groningen. The great number of students in the city and the stimulating policy of the township result in a 60 percent share of cyclists in normal day traffic. Hence you could say Groningen is the bicycle capital of the world. That is obviously something to be proud of, as it contributes to a better world. However, the extreme amount of cyclists in Groningen also causes multiple problems for the city. What is the downside of […]
The Riemann Hypothesis, a mathematical hypothesis conjectured by famous mathematician Bernhard Riemann, is one of the seven most famous mathematical problems of the last millennium. A price of one million dollars is awarded to the person who provides a solution to one of these problems. The Riemann Hypothesis is used in a multitude of other mathematical proofs, mostly in prime number theory. Therefore, it is crucial that the hypothesis is proven. Definition of the Riemann Hypothesis To start: The Riemann hypothesis states that all nontrivial zeros of the continuous analytic extension of the Riemann Zeta […]
We have all seen it at least once in our life: ‘Guess the number of M&M’s in the jar and win …’. Unfortunately, most of us have never been able to give an accurate guess. However, there exists a concept that can consistently yield accurate guesses. The wisdom of crowds is the concept that a large group of people has a higher collective intelligence than individual experts. This idea is applicable to a vast variety of instances including problem-solving, decision-making, forecasting, and policymaking. For example, some companies measure market sentiment via Twitter feeds. Data from […]
In 1953 publiceerde Ernest Wynder een onderzoek over longkanker, waarbij hij het teer uit sigaretten met een borstel op 81 muizen smeerde. Het resultaat van dit onderzoek was dat 44 procent van de ingesmeerde muizen kanker had gekregen en slechts 10 procent van de totale groep was na twintig maanden nog in leven. Bij de niet-ingesmeerde muizen was er bij geen van hen kanker gevonden en 53 procent was nog in leven na twintig maanden. Vanzelfsprekend liet dit onderzoek vele mensen schrikken. Het gevolg hiervan was dat de aandelen van de tabaksindustrie flink in waarde […]
We live in a time where we pay a lot of attention to the environment. You should always be looking for improvements and those can be found in the most extraordinary fields. You might wonder how painting a cow can save the planet, and that is a perfectly good question to ask yourself. Fortunately, that will be explained in this article. First of all, painting a cow can be read in multiple ways. In this case we are talking about applying paint on the skin of a cow. Experimental studies suggest that cows painted […]
In the article posted 4 weeks ago about the dark side of the tennis world I talked about how vulnerable the tennis sport is to match fixing. Bets can even be placed on every single point. However, is there a way to predict the outcome of matches and maybe even points? There are multiple articles that have tried to solve this problem. Many of these articles mention Markov models as I explained earlier. Now I will be digging deeper into this subject and try to predict a match between Rafael Nadal and Roger Federer. Markov […]
Almost everybody enjoys some nice piano music, at least occasionally. Although some more keen of the instrument than others, many would claim being able to diagnose an out-of-tune piano. Fact is, however, that a piano is never in perfect tune. I’ll tell you why. The piano is an instrument that, like the guitar, uses the vibration of its strings to produce sound. The tone that a string produces is determined by multiple factors, such as its length, tension and composition. On the piano string, waves reflect from both ends. The superposition of reflecting waves […]
Het is zaterdagavond, je bent net thuis, moet nog eten en je hebt totaal geen zin om te koken. Oplossing? Thuisbezorgd.nl. Wij studenten weten maar al te goed hoe handig het kan zijn om van de diensten van Thuisbezorgd of welke andere bezorgdienst dan ook gebruik te maken. In het dagelijks straatbeeld zijn de scooters met de Thuisbezorgd reclame dan ook bijna niet meer weg te denken. Het zal je daarom ook niet verbazen dat Thuisbezorgd in 2018 een omzet heeft gedraaid van welgeteld 240 miljoen euro. Dat terwijl in 2017 deze omzet ‘slechts’ 120 […]
De redactie van De Econometrist bestaat momenteel uit 12 leden die samen een hechte groep vormen. Regelmatig onderneemt de groep leuke activiteiten. Als je alle redacteurs wilt zien kijk dan op de redactie pagina.