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Record W7046046222

Comparando métodos de aprendizado de máquina para previsão da demanda de viagens de bicicletas da BIXI Montreal e análise do efeito da pandemia de COVID-19 na demanda de 2020

2022· other· pt· W7046046222 on OpenAlexaboutno aff

Bibliographic record

VenueCEUB (University Center of Brasília) · 2022
Typeother
Languagept
FieldDecision Sciences
TopicForecasting Techniques and Applications
Canadian institutionsnot available
Fundersnot available
KeywordsEconomic shortageStatistical analysisWork (physics)
DOInot available

Abstract

fetched live from OpenAlex

A previsão de demanda é uma atividade estratégica para uma organização planejar e dimensionar os recursos necessários para a produção de bens e serviços de forma a atender sua demanda e não ter prejuízos. Visto que estima o futuro, ela pode ser impactada com alterações no ambiente externo, como foi o caso da pandemia de COVID-19. Nesse sentido, esse trabalho tem como objetivo analisar como a demanda da BIXI Montreal foi impactada pela pandemia de COVID-19, comparando os valores reais de 2020 com valores projetados utilizando modelos de aprendizado de máquina e dados históricos. Para isso, quatro modelos usando os algoritmos LinearRegression, DecisionTreeRegressor, RandomForestRegressor e XGBRegressor de pacotes do Python foram elaborados e seus desempenhos avaliados considerando as métricas MAE, MSE, RMSE e Score. A partir disso, o melhor modelo foi escolhido, sendo utilizado para prever a demanda de 2020 e comparar a demanda real com a contrafactual. De forma geral, o modelo de Random Forest apresentou o melhor desempenho e foram realizadas três previsões de demanda diferentes. Uma delas apresentou um resultado de demanda muito superestimado. As outras duas apresentaram resultados mais realistas, demonstrando possibilidades da demanda em um cenário mais conservador e outro mais otimista. Por fim, concluiu-se que a demanda de quantidade de viagens da BIXI Montreal sofreu um impacto negativo entre 32% e 125% por causa da pandemia.

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 distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.004
metaresearch head score (Gemma)0.001
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesMeta-epidemiology (narrow), Science and technology studies, Insufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Not applicable · Consensus signal: Not applicable
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.446
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0040.001
Meta-epidemiology (narrow)0.0010.001
Meta-epidemiology (broad)0.0020.001
Bibliometrics0.0010.002
Science and technology studies0.0010.001
Scholarly communication0.0010.000
Open science0.0040.002
Research integrity0.0010.001
Insufficient payload (model declined to judge)0.0120.000

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 head0.096
GPT teacher head0.357
Teacher spread0.261 · 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 teacher head, not a consensus.

Study designNot applicable
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".

Quick stats

Citations0
Published2022
Admission routes1
Has abstractyes

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