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ПРОГНОЗИРОВАНИЕ НЕСТАЦИОНАРНЫХ ВРЕМЕННЫХ РЯДОВ НА ОСНОВЕ МУЛЬТИВЕЙВЛЕТНОЙ ПОЛИМОРФНОЙ СЕТИ

2018· article· en· W4400649357 on OpenAlexaboutno aff
S.N. Verzunov, N.M. Lychenko

Bibliographic record

VenueModelirovanie, optimizaciâ i informacionnye tehnologii. · 2018
Typearticle
Languageen
FieldDecision Sciences
TopicStock Market Forecasting Methods
Canadian institutionsnot available
Fundersnot available
KeywordsBusiness

Abstract

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There are many methods and models for forecasting non-stationary time series. How-ever, the problem of the accuracy and adequacy of the forecast of non-stationary time series has not been solved yet. In this paper, a new forecast model, based on a multiwavelet network with additional customizable parameters, which is called polymorphic, is proposed. The effi-ciency of the proposed model is compared with the well-known time series forecast models like autoregressive integrated moving average model, multilayer perceptron and hybrid model in which both models are combined. Three well-known real data sets (the Wolf's sunspot data, the Canadian lynx data and the British pound/US dollar exchange rate data) were taken as empir-ical data. The comparison showed that forecast model based on the proposed multiwavelet polymorphic network has a smaller prediction error for each series. This is achieved by intro-ducing additional customizable parameters into the wavelet network, which allow to better adapt to the non-stationary nature of time series. Moreover, for the wavelet network to per-form well in the presence of linearity, were used linear connections between the wavelet neu-rons of input and output layers. The proposed technology can be used to predict the time series generated by dynamic processes of a different nature Для прогнозирования нестационарных временных рядов существует много методов и моделей, однако, проблема точности и адекватности прогноза таких рядов по-прежнему является актуальной. В настоящей статье предложена новая модель прогноза, основанная на мультивейвлетной сети с дополнительными настраиваемыми параметрами, названной полиморфной. Эффективность предложенной модели сравнена с хорошо известными моделями прогноза временных рядов: моделью авторегрессионного интегрированного скользящего среднего, многослойным персептроном и гибридной моделью, комбинирующей обе указанные модели. В качестве экспериментальных данных были использованы три реальных, хорошо известных в статистике временных ряда: данные о солнечных пятнах Вольфа, данные о популяции канадской рыси и данные об обменном курсе британского фунта к доллару США. Сравнение показало, что предложенная модель прогноза на основе мультивейвлетной полиморфной сети обладает меньшей ошибкой прогноза для всех рассмотренных рядов. Это достигнуто благодаря введению дополнительных настраиваемых параметров в вейвлет-сеть, которые позволяют лучше адаптироваться к нестационарной природе временных рядов. Кроме того, наличие в структуре предложенной вейвлет-сети прямых связей между вейвлет-нейронами входного и выходного слоев улучшает ее прогностические свойства для временных рядов, имеющих линейную составляющую. Предложенная технология может быть использована для прогноза временных рядов, генерируемых динамическими процессами различной физической природы.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.002
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Simulation or modeling · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.009
Threshold uncertainty score0.030

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0010.002
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0010.001
Science and technology studies0.0010.001
Scholarly communication0.0020.001
Open science0.0000.001
Research integrity0.0010.001
Insufficient payload (model declined to judge)0.0090.004

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.159
GPT teacher head0.417
Teacher spread0.258 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designSimulation or modeling
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

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Published2018
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