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📝 Rascunhos · apenas admin 5
📝 Rascunho August 25, 2026
#machine-learning
XGBoost for Return Direction: Class Imbalance and Decision Thresholds
Return-direction classifiers are imbalanced problems, and 0.5 is the wrong decision threshold. Comparing scale_pos_weight, focal loss, and precision-constrained threshold optimization on crypto data — plus the engineering differences between XGBoost, LightGBM, and CatBoost.
#machine-learning#xgboost#gradient-boosting
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📝 Rascunho August 24, 2026
#causal-inference
Transfer Entropy: Which Way Does Information Flow Between Crypto Assets?
DCC-GARCH tells you when crypto dependence tightens. Transfer entropy tells you which way it points. A directed information-flow measure, its null calibration, and an honest account of what it does and does not add over average pairwise correlation.
#causal-inference#transfer-entropy#information-theory
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📝 Rascunho August 21, 2026
#causal-inference
Métodos de controle sintético para avaliar estratégias de negociação
Esta série precificou a rota de seleção até uma vantagem falsa - o DSR avalia o vencedor, o PBO avalia a pesquisa. Nenhum dos dois toca em confusão: a estratégia que rendeu dinheiro porque a volatilidade dobrou na semana em que você a implementou. O Método de Controle Sintético constrói um cenário contrafactual ponderado a partir de um conjunto de doadores de instrumentos intocados e fornece um critério de falsificação e um valor p placebo.
#causal-inference#synthetic-control#counterfactual
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August 14, 2026
#model-compression
Model Pruning for Low-Latency Trading Inference
Magnitude and structured pruning, the Lottery Ticket Hypothesis, movement pruning, distillation and 2:4 sparsity — the methods behind shrinking a trading model, and what still has to be measured before any of it ships.
#model-compression#pruning#lottery-ticket
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