Ensemble Methods Comparison: Bagging, Boosting, and Stacking Techniques
Bagging Classifier Implementation
Base Model Performance
base_model = DecisionTreeClassifier(random_state=42)
base_model.fit(X_train, y_train)
y_pred_base = base_model.predict(X_test)
base_recall = recall_score(y_test, y_pred_base)
print("Recall del modelo base: {:.4f}".format(base_recall))Hyperparameter Tuning (Grid Search)
param_grid = {
"n_estimators": [10, 50, 100],
"max_samples": [0.5, 0.8, 1.0],
"max_features": [0.5, 0.8, 1.0],
"bootstrap": [True]
}
bagging = BaggingClassifier(Mercantilism: From Classical Empires to Modern Economic Nationalism
The Mercantilist and Economic Nationalist Perspective
1. What is Mercantilism? Definition and Core Perspective
- Mercantilism is a state-centered approach in International Political Economy (IPE).
- It views the economy as a tool for national power and security, not as a neutral system.
- It is based on the idea that international relations are a continuous power struggle.
- It assumes that the international economy is a zero-sum game: one state’s gain is another’s loss.
- Wealth is considered finite, so every
Semiconductor Devices: Fundamentals of Doping, Transistors, and Rectification
Doped Semiconductors and Energy Band Theory
Why Impure Semiconductors (Doping) Are Necessary
- Pure (intrinsic) Si/Ge have very low conductivity at room temperature.
- Doping adds controlled carriers, leading to practical conductivity and device action.
- n-type (Donors, 5 valence e⁻): Impurities like P, As, Sb create majority electrons.
- p-type (Acceptors, 3 valence e⁻): Impurities like B, Ga, In create majority holes.
- Doping is used to engineer essential devices like diodes, BJTs, JFETs, MOSFETs, and resistors.
Spanish Literary History: Journalism and Drama in the 20th Century
The Interplay of Literature and Journalism in Spain
The Press as a Vehicle for Cultural Transmission (Pre-1950)
The press was key to primary cultural transmission and the formation of political criteria. Writers utilized journals to disseminate their ideas, and newspapers published high-quality weekly literary supplements.
Key Figures in Early Literary Journalism
- Unamuno: Started writing in El Noticiero Bilbaíno and contributed to many newspapers. His most famous work was published as a series of twelve
Discourse Analysis: Utterance, Mediation, and Genre Components
The Three Gates of Communication and Discourse Analysis
Gate 1: Utterance, Message, and Reception Dynamics
The utterance is the time when the sender is encoding a message and transmitting it. Utterance and reception become inseparable; they cannot exist without each other.
Discourse (or Speech) is the result of a particular utterance; it is determined, unique, and unrepeatable. However, the utterance may remain even if the issuer is no longer present.
The message is understood as “what was transmitted.
Read MoreLiterary Transformation: The Spanish Novel from the 19th Century to the Generation of ’98
The Novel in the 19th and 20th Centuries: Transformation
The nineteenth-century novel responded to a stable conception of the world and aimed to offer an orderly and coherent picture of reality. By contrast, in the twentieth century, man’s insecurity in the world undergoes deep transformations, leading to narratives tinged with anguish and subjectivism.
In the last years of the nineteenth century and the first third of the twentieth, the realistic or naturalistic formulations of the novel continued
Read MoreDNA Replication and RNA Transcription in Prokaryotes and Eukaryotes
DNA Replication in Prokaryotes
In bacteria, in addition to the main DNA molecule, there are small circular DNA molecules called plasmids. These plasmids may or may not replicate simultaneously with the main chromosome using a similar mechanism. All plasmid DNA introduced into bacteria must possess a replication origin sequence to be multiplied by the replication machinery.
Eukaryotic DNA Replication Complexity
In eukaryotes, the rate of replication of nuclear DNA is more complex than in bacteria for
Read MoreEssential English Grammar: Tenses, Articles, and Modals
Verb Classification and Forms
Verbs are categorized as either Lexical Verbs (e.g., drive, cook) or Auxiliary Verbs.
Auxiliary Verbs
- Primary Auxiliary Verbs: Can function as both auxiliary or main verbs (e.g., have, be, do).
- Modal Auxiliary Verbs: (e.g., must, can, will).
Verb Forms
- Base Form: Imperative, Present, Infinitive (e.g., drive).
- S-Form: Present third-person singular (e.g., drives).
- Past Form: (e.g., drove).
- -ing Form: Gerund or Active Participle (e.g., driving).
- Past/Passive Participle: (e.g., driven)
Global Insights: Culture, Science, and History Highlights
Michael Smith: Michelin-Starred Chef of the Highlands
- The Three Witches.
- In his hometown.
- He spent four years in London.
- Shirley Spear offered Smith the opportunity to work at The Three Chimneys.
- He worked there for eleven years.
- He was happy with his life on the isle.
- She thinks his work is appreciated by local people.
- He likes cooking and sees a Michelin star as the result of combining good products and a lively atmosphere.
Making Music After Brain Surgery
- She had a turning point in her career briefly after
Southern European Welfare Model: Characteristics and Policy Challenges
The Southern European Welfare Model
The Southern European countries must reconcile the demands of the economy with their current systems of social protection. The Southern Model faces several critical challenges:
- Population Aging: This involves the rising demand for specific services and an increasing dependency ratio.
- Labor Market Issues: Low employment rates and persistently high unemployment.
- Changing Family Structures: The rise of single-person households and single parents, compounded by the challenges