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title: "Parameter Reference Guide"
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# E2E Package Parameter Reference Guide

This guide provides comprehensive parameter documentation for all E2E functions.

## Built-in Datasets

E2E includes example datasets for both diagnostic and prognostic modeling:

### Diagnostic Datasets
- **train_dia**: Training data with sample IDs (column 1), outcomes 0/1 (column 2), and features (columns 3+)
- **test_dia**: Test data with the same structure

### Prognostic Datasets  
- **train_pro**: Training data with sample IDs (column 1), survival status 0/1 (column 2), survival time (column 3), and features (columns 4+)
- **test_pro**: Test data with the same structure

## Built-in Models

### Diagnostic Models (12 algorithms)
- **rf**: Random Forest
- **xb**: XGBoost  
- **svm**: Support Vector Machine
- **mlp**: Multi-Layer Perceptron
- **lasso**: L1-regularized Logistic Regression
- **en**: Elastic Net
- **ridge**: L2-regularized Logistic Regression
- **lda**: Linear Discriminant Analysis
- **qda**: Quadratic Discriminant Analysis
- **nb**: Naive Bayes
- **dt**: Decision Tree
- **gbm**: Gradient Boosting Machine

### Prognostic Models (6 algorithms)
- **lasso_pro**: Lasso Cox Regression
- **en_pro**: Elastic Net Cox Regression  
- **ridge_pro**: Ridge Cox Regression
- **stepcox_pro**: Stepwise Cox Regression
- **gbm_pro**: Gradient Boosting Machine
- **rsf_pro**: Random Survival Forest

# Diagnostic Modeling Functions

## models_dia()
Trains base classification models for diagnostic tasks.
**Parameters:**

- `data` (required): Data frame with sample names (column 1), outcomes 0/1 (column 2), features (columns 3+)

- `model` (required): Character vector of model names or "all_dia" for all models

- `tune`: Logical (default FALSE). Whether to perform hyperparameter tuning

- `threshold_choices`: Threshold selection method
  - "default" (default): Fixed 0.5 threshold
  - "f1": Optimize F1 score
  - "youden": Optimize Youden index  
  - Numeric value (0-1): Custom threshold
  
- `seed`: Integer (default 123). Random seed for reproducibility

## bagging_dia()
Bootstrap aggregating ensemble method.
**Parameters:**

- `data` (required): Training data frame

- `base_model_name` (required): Base model name (e.g., "xb", "rf")

- `n_estimators`: Integer (default 50). Number of base models

- `subset_fraction`: Numeric (default 0.632). Bootstrap sampling fraction

- `tune_base_model`: Logical (default FALSE). Tune base models

- `threshold_choices`: Same as models_dia()

- `seed`: Integer (default 123). Random seed

## voting_dia()
Voting ensemble combining multiple models.
**Parameters:**

- `results_all_models` (required): Output from models_dia()

- `data` (required): Training data

- `type`: Voting type

  - "soft" (default): Weighted probability averaging
  - "hard": Majority voting
  
- `weight_metric`: String (default "AUROC"). Metric for soft voting weights

- `top`: Integer (default 5). Number of top models to use

- `threshold_choices`: Same as models_dia()

- `seed`: Integer (default 123). Random seed

## stacking_dia()
Stacking ensemble with meta-model.
**Parameters:**

- `results_all_models` (required): Output from models_dia()

- `data` (required): Training data

- `meta_model_name` (required): Meta-model name (e.g., "lasso", "gbm")

- `top`: Integer (default 5). Number of top base models

- `tune_meta`: Logical (default FALSE). Tune meta-model

- `threshold_choices`: Same as models_dia()

- `seed`: Integer (default 123). Random seed

## imbalance_dia()
Handles imbalanced datasets using EasyEnsemble-like algorithm.
**Parameters:**

- `data` (required): Imbalanced training data

- `base_model_name` (required): Base model for balanced subsets

- `n_estimators`: Integer (default 10). Number of balanced subsets

- `tune_base_model`: Logical (default FALSE). Tune base models

- `threshold_choices`: Same as models_dia()

- `seed`: Integer (default 123). Random seed

## apply_dia()
Applies trained model to new data.
**Parameters:**

- `trained_model_object` (required): Trained model object from E2E functions

- `new_data` (required): New data for prediction (sample IDs in column 1)

- `label_col_name`: String (default NULL). True label column name if available

## evaluate_predictions_dia()
Evaluates model predictions.
**Parameters:**

- `prediction_df` (required): Prediction data frame from apply_dia()

- `threshold_choices`: Same as models_dia()

# Prognostic Modeling Functions

## models_pro()
Trains base survival models.
**Parameters:**

- `data` (required): Data frame with sample ID, survival status, time, features

- `model` (required): Model names or "all_pro" for all models

- `tune`: Logical (default FALSE). Hyperparameter tuning

- `time_unit`: String (default "day"). Time unit ("day", "month", "year")

- `years_to_evaluate`: Numeric vector (default c(1,3,5)). Time points for time-dependent AUROC

- `seed`: Integer (default 789). Random seed

## stacking_pro()
Stacking ensemble for survival analysis.
**Parameters:**

- `results_all_models` (required): Output from models_pro()

- `data` (required): Training data

- `meta_model_name` (required): Meta-model name

- `top`: Integer (default 3). Number of top base models

- `tune_meta`: Logical (default FALSE). Tune meta-model

- `time_unit`: String (default "day"). Time unit

- `years_to_evaluate`: Numeric vector (default c(1,3,5)). Evaluation time points

- `seed`: Integer (default 789). Random seed

## bagging_pro()
Bootstrap aggregating for survival analysis.
**Parameters:**

- `data` (required): Training data

- `base_model_name` (required): Base model name

- `n_estimators`: Integer (default 10). Number of base models

- `subset_fraction`: Numeric (default 0.632). Bootstrap sampling fraction

- `tune_base_model`: Logical (default FALSE). Tune base models

- `time_unit`: String (default "day"). Time unit

- `years_to_evaluate`: Numeric vector (default c(1,3,5)). Evaluation time points

- `seed`: Integer (default 456). Random seed

## apply_pro()
Applies trained survival model to new data.
**Parameters:**

- `trained_model_object` (required): Trained model object

- `new_data` (required): New data with same structure as training data

- `time_unit`: String (default "day"). Time unit

## evaluate_predictions_pro()
Evaluates survival model predictions.
**Parameters:**

- `prediction_df` (required): Prediction data frame from apply_pro()

- `years_to_evaluate`: Numeric vector (default c(1,3,5)). Evaluation time points

# Visualization Functions

## figure_dia()
Creates diagnostic model evaluation plots.
**Parameters:**

- `type` (required): Plot type
  - "roc": ROC curve
  - "prc": Precision-recall curve
  - "matrix": Confusion matrix
  
- `data` (required): Model results object

## figure_pro()
Creates prognostic model evaluation plots.
**Parameters:**

- `type` (required): Plot type
  - "km": Kaplan-Meier survival curves
  - "tdroc": Time-dependent ROC curves
  
- `data` (required): Model results object

- `time_unit`: String (default "days"). Time unit for axis labels

## figure_shap()
Creates SHAP interpretation plots.
**Parameters:**

- `data` (required): Model results with sample_score data frame

- `raw_data` (required): Original feature data

- `target_type` (required): Data type
  - "diagnosis": Features start from column 3
  - "prognosis": Features start from column 4

# Custom Model Registration

## register_model_dia() / register_model_pro()
Registers custom algorithms.

**Usage:**
1. Define custom function following E2E conventions
2. Register with `register_model_dia("model_name", custom_function)`
3. Use registered model in E2E workflows