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2016 ; 11
(11
): e0165736
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Discovering Periodic Patterns in Historical News
#MMPMID27824911
Dzogang F
; Lansdall-Welfare T
; Cristianini N
PLoS One
2016[]; 11
(11
): e0165736
PMID27824911
show ga
We address the problem of observing periodic changes in the behaviour of a large
population, by analysing the daily contents of newspapers published in the United
States and United Kingdom from 1836 to 1922. This is done by analysing the daily
time series of the relative frequency of the 25K most frequent words for each
country, resulting in the study of 50K time series for 31,755 days. Behaviours
that are found to be strongly periodic include seasonal activities, such as
hunting and harvesting. A strong connection with natural cycles is found, with a
pronounced presence of fruits, vegetables, flowers and game. Periodicities
dictated by religious or civil calendars are also detected and show a different
wave-form than those provoked by weather. States that can be revealed include the
presence of infectious disease, with clear annual peaks for fever, pneumonia and
diarrhoea. Overall, 2% of the words are found to be strongly periodic, and the
period most frequently found is 365 days. Comparisons between UK and US, and
between modern and historical news, reveal how the fundamental cycles of life are
shaped by the seasons, but also how this effect has been reduced in modern times.
|*Behavior
[MESH]
|*Periodicity
[MESH]
|Fourier Analysis
[MESH]
|History, 19th Century
[MESH]
|History, 20th Century
[MESH]
|Humans
[MESH]
|Language
[MESH]
|Newspapers as Topic/history/*statistics & numerical data
[MESH]
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