Internal Change Points and External Transmissions

2020 ◽  
Author(s):  
Liu Hao
Keyword(s):  
Change Points ◽  
Internal Change

Modern Greek V V dvandva compounds: A linguistic innovation in the history of the Indo-European languages

2009 ◽  
Vol 2 (1) ◽  
pp. 48-68 ◽  
Author(s):  
Angela Ralli
Keyword(s):  
Language Contact ◽  
High Rate ◽  
Compound Formation ◽  
Modern Greek ◽  
Late Medieval Period ◽  
European Languages ◽  
History Of ◽  
Internal Change ◽  
Contact Situation ◽  
Asian Languages

This paper deals with [V V] dvandva compounds, which are frequently used in East and Southeast Asian languages but also in Greek and its dialects: Greek is in this respect uncommon among Indo-European languages. It examines the appearance of this type of compounding in Greek by tracing its development in the late Medieval period, and detects a high rate of productivity in most Modern Greek dialects. It argues that the emergence of the [V V] dvandva pattern is not due to areal pressure or to a language-contact situation, but it is induced by a language internal change. It associates this change with the rise of productivity of compounding in general, and the expansion of verbal compounds in particular. It also suggests that the change contributes to making the compound-formation patterns of the language more uniform and systematic. Claims and proposals are illustrated with data from Standard Modern Greek and its dialects. It is shown that dialectal evidence is crucial for the study of the rise and productivity of [V V] dvandva compounds, since changes are not usually portrayed in the standard language.

scholarly journals Breton a-marking of (internal) verbal arguments: A result of language contact?

Linguistics ◽  
2020 ◽  
Vol 58 (3) ◽  
pp. 745-766
Author(s):  
Elisabeth Stark ◽  
Paul Widmer
Keyword(s):  
Language Contact ◽  
Object Position ◽  
Relative Chronology ◽  
Celtic Languages ◽  
Potential Case ◽  
Existential Constructions ◽  
History Of ◽  
Internal Change ◽  
Pronominal System ◽  
Verbal Arguments

AbstractWe discuss a potential case of borrowing in this paper: Breton a- ‘of’, ‘from’ marking of (internal) verbal arguments, unique in Insular Celtic languages, and reminiscent of Gallo-Romance de/du- (and en-) arguments. Looking at potential Gallo-Romance parallels of three Middle Breton constructions analyzed in some detail (a with indefinite mass nominals in direct object position, a-marking of internal arguments under the scope of negation, a [allomorphs an(ez)-/ahan-] with personal pronouns for internal arguments, subjects (mainly of predicative constructions) and as expletive subjects of existential constructions), we demonstrate that even if there are some semantic parallels and one strong structural overlap (a and de under the scope of negation), the amount of divergences in morphology, syntax and semantics and the only partially fitting relative chronology of the different constructions do not allow to conclude with certainty that language-contact is an explanation of the Breton facts, which might have come into being also because of internal change (bound to restructuring of the pronominal system in Breton). More research is necessary to complete our knowledge of a-marking in Middle Breton and Modern Breton varieties and on the precise history of French en, in order to decide for one or the other explanation.

scholarly journals A copula-based multivariate hidden Markov model for modelling momentum in football

2021 ◽  
Author(s):  
Marius Ötting ◽  
Roland Langrock ◽  
Antonello Maruotti
Keyword(s):  
Markov Model ◽  
Hidden Markov Models ◽  
Markov Models ◽  
Hidden Markov ◽  
State Dependence ◽  
Change Points ◽  
Sports Fans ◽  
Modelling Framework ◽  
State Dependent ◽  
Different Levels

AbstractWe investigate the potential occurrence of change points—commonly referred to as “momentum shifts”—in the dynamics of football matches. For that purpose, we model minute-by-minute in-game statistics of Bundesliga matches using hidden Markov models (HMMs). To allow for within-state dependence of the variables, we formulate multivariate state-dependent distributions using copulas. For the Bundesliga data considered, we find that the fitted HMMs comprise states which can be interpreted as a team showing different levels of control over a match. Our modelling framework enables inference related to causes of momentum shifts and team tactics, which is of much interest to managers, bookmakers, and sports fans.

scholarly journals Change Point Enhanced Anomaly Detection for IoT Time Series Data

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1633
Author(s):  
Elena-Simona Apostol ◽  
Ciprian-Octavian Truică ◽  
Florin Pop ◽  
Christian Esposito
Keyword(s):  
Time Series ◽  
Anomaly Detection ◽  
Change Point ◽  
Time Series Data ◽  
Multivariate Time Series ◽  
Change Point Detection ◽  
Change Points ◽  
Series Data ◽  
Prediction And Forecasting ◽  
Point Detection

Due to the exponential growth of the Internet of Things networks and the massive amount of time series data collected from these networks, it is essential to apply efficient methods for Big Data analysis in order to extract meaningful information and statistics. Anomaly detection is an important part of time series analysis, improving the quality of further analysis, such as prediction and forecasting. Thus, detecting sudden change points with normal behavior and using them to discriminate between abnormal behavior, i.e., outliers, is a crucial step used to minimize the false positive rate and to build accurate machine learning models for prediction and forecasting. In this paper, we propose a rule-based decision system that enhances anomaly detection in multivariate time series using change point detection. Our architecture uses a pipeline that automatically manages to detect real anomalies and remove the false positives introduced by change points. We employ both traditional and deep learning unsupervised algorithms, in total, five anomaly detection and five change point detection algorithms. Additionally, we propose a new confidence metric based on the support for a time series point to be an anomaly and the support for the same point to be a change point. In our experiments, we use a large real-world dataset containing multivariate time series about water consumption collected from smart meters. As an evaluation metric, we use Mean Absolute Error (MAE). The low MAE values show that the algorithms accurately determine anomalies and change points. The experimental results strengthen our assumption that anomaly detection can be improved by determining and removing change points as well as validates the correctness of our proposed rules in real-world scenarios. Furthermore, the proposed rule-based decision support systems enable users to make informed decisions regarding the status of the water distribution network and perform effectively predictive and proactive maintenance.

scholarly journals Detecting multiple generalized change-points by isolating single ones

Metrika ◽  
2021 ◽  
Author(s):  
Andreas Anastasiou ◽  
Piotr Fryzlewicz
Keyword(s):  
Model Selection ◽  
Linear Trend ◽  
Information Criterion ◽  
Change Points ◽  
Isolation Technique ◽  
New Approach ◽  
Piecewise Constant ◽  
Practical Performance ◽  
R Packages ◽  
The Times

AbstractWe introduce a new approach, called Isolate-Detect (ID), for the consistent estimation of the number and location of multiple generalized change-points in noisy data sequences. Examples of signal changes that ID can deal with are changes in the mean of a piecewise-constant signal and changes, continuous or not, in the linear trend. The number of change-points can increase with the sample size. Our method is based on an isolation technique, which prevents the consideration of intervals that contain more than one change-point. This isolation enhances ID’s accuracy as it allows for detection in the presence of frequent changes of possibly small magnitudes. In ID, model selection is carried out via thresholding, or an information criterion, or SDLL, or a hybrid involving the former two. The hybrid model selection leads to a general method with very good practical performance and minimal parameter choice. In the scenarios tested, ID is at least as accurate as the state-of-the-art methods; most of the times it outperforms them. ID is implemented in the R packages IDetect and breakfast, available from CRAN.

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