105 citations · 477 across the 60 of their papers we have counts for
25 papers · 1 filter
Cliophysics: A scientific analysis of recurrent historical events
Yuji Aruka, Belal Baaquie, Xiasong Chen +6
Named after Clio, the Greek goddess of history, cliophysics is a daughter (and in a sense an extension) of econophysics. Like econophysics it relies on the methodology of experimen…
Impact of personal income on mortality by age: biological versus socio-economic effects
Peter Richmond, Wonguk Cho, Beom Jun Kim +1
The influence of per capita income on life expectancy is well documented, mostly through studies of multinational samples. However, one expects fairly weak correlations at both end…
The influence of Lent on marriages and conceptions explored through a new methodology
Claudiu Herteliu, Peter Richmond, Bertrand M. Roehner
Herteliu et al. (2015) have elsewhere analyzed the impact of religious festivals on births in Romania. Here we broaden the analysis (i) by studying the effect of Lent on marriages…
How can population pyramids be used to explore the past?
Bertrand M. Roehner
In the same way as tree rings give us useful information about the climate many decades ago (or even centuries ago in the case of big trees), population pyramids allow us to know b…
Effect of population density on epidemics
Ruiqi Li, Peter Richmond, Bertrand M. Roehner
Investigations of a possible connection between population density and the propagation and magnitude of epidemics have so far led to mixed and unconvincing results. There are three…
Coupling between death spikes and birth troughs. Part 2: Comparative analysis of salient features
Peter Richmond, Bertrand M. Roehner
In part 1 we identified a new coupling between death spikes and birth dips that occurs following catastrophic events such as influenza pandemics and earthquakes. Here we seek to ch…
Coupling between death spikes and birth troughs. Part 1: Evidence
Peter Richmond, Bertrand M. Roehner
In the wake of the influenza pandemic of 1889-1890 Jacques Bertillon, a pioneer of medical statistics, noticed that after the massive death spike there was a dip in birth numbers a…
Spatial and historical determinants of separatism and integration. 2. Quantitative analysis
Bertrand M. Roehner
In part 1 we have discussed the role played by geographical and historical conditions. Here we wish to test our model and to estimate its parameters. Ti this effect two indexes are…
Spatial and historical determinants of separatism and integration. 1. Qualitative analysis
Bertrand M. Roehner
Separatism is examined in a long-run perspective. Accordingly, many political or economic factors which may be crucial in dealing with short-term episodes can be safely disregarded…
Exploration of the strength of family links
Peter Richmond, Bertrand M. Roehner
Ever since the studies of Louis-Adolphe Bertillon in the late 19th century it has been known that marital status and number of children markedly affect death and suicide rates. Thi…
Impact of marital status on health
Peter Richmond, Bertrand M. Roehner
The Farr-Bertillon law states that the mortality rate of single and widowed persons is about three times the rate of married people of same age. This excess mortality can be measur…
Predictive implications of Gompertz's law
Peter Richmond, Bertrand M. Roehner
Gompertz's law tells us that for humans above the age of 35 the death rate increases exponentially with a doubling time of about 10 years. Here, we show that the same law continues…
Effect of marital status on death rates. Part 2: Transient mortality spikes
Peter Richmond, Bertrand M. Roehner
We examine what happens in a population when it experiences an abrupt change in surrounding conditions. Several cases of such "abrupt transitions" for both physical and living soci…
Effect of marital status on death rates. Part 1: High accuracy exploration of the Farr-Bertillon effect
Peter Richmond, Bertrand M. Roehner
The Farr-Bertillon law says that for all age-groups the death rate of married people is lower than the death rate of people who are not married (i.e. single, widowed or divorced).…
The detection of cheating in multiple choice examinations
Peter Richmond, Bertrand M. Roehner
Cheating in examinations is acknowledged by an increasing number of organizations to be widespread. We examine two different approaches to assess their effectiveness at detecting a…
How can one explain changes in the monthly pattern of suicide?
Bertrand M. Roehner
The monthly pattern of suicides has remained a puzzle ever since it was discovered in the second half of the 19th century. In this paper we intend to "explain" not the pattern itse…
Is the month of Ramadan marked by a reduction in the number of suicides?
Bertrand M. Roehner
For Muslims the month of Ramadan is a time of fasting but during the evenings after sunset it is also an occasion for family and social gatherings. Therefore, according to the Bert…
How are mortality rates affected by population density?
Lei Wang, Yijuan Xu, Zengru Di +1
Biologists have found that the death rate of cells in culture depends upon their spatial density. Permanent "Stay alive" signals from their neighbours seem to prevent them from dyi…
Fifteen years of econophysics: worries, hopes and prospects
Bertrand M. Roehner
This anniversary paper is an occasion to recall some of the events that shaped institutional econophysics. But in these thoughts about the evolution of econophysics in the last 15…
A physicist's view of the notion of "racism"
Charles Jego, Bertrand M. Roehner
It is not uncommon, e.g. in the media, that specific groups are categorized as being racist. Based on an extensive dataset of intermarriage statistics our study questions the legit…
White flight or flight from poverty?
Charles Jego, Bertrand M. Roehner
The phenomenon of White flight is often illustrated by the case of Detroit whose population dropped from 1.80 million to 0.95 million between 1950 and 2000 while at the same time i…
Real estate price peaks: a comparative overview
Bertrand M. Roehner
First, we emphasize that the real estate price peaks which are currently under way in many industrialized countries (one important exception is Japan) share many of the characteris…
Suicide: the key role of short range ties
Bertrand M. Roehner
The paper explores the connection between short-range social ties (i.e. links with close relatives) and the occurrence of suicide. The objective is to discriminate between a model…
Consensus formation: The case of using cell phones while driving
Bertrand M. Roehner
Several models (including the widely used Sznajd model) have been proposed in order to describe the social phenomenon of consensus formation. The objective of the present paper is…