# Deep Learning Prediction with CHAID and Time-Series Splitting

> Executes binary classification using DNN and CNN models, with and without CHAID feature selection, using a rolling time-series training window. Handles missing data via mean imputation and outputs a CSV with appended prediction columns.

- Skill: `ecnu-icalk/deep-learning-prediction-with-chaid-and-time-series-splittin` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ecnu-icalk/deep-learning-prediction-with-chaid-and-time-series-splittin`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ecnu-icalk/deep-learning-prediction-with-chaid-and-time-series-splittin/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: ECNU-ICALK (https://skillmd.com/u/ecnu-icalk)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/ecnu-icalk/deep-learning-prediction-with-chaid-and-time-series-splittin

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# Deep Learning Prediction with CHAID and Time-Series Splitting

Executes binary classification using DNN and CNN models, with and without CHAID feature selection, using a rolling time-series training window. Handles missing data via mean imputation and outputs a CSV with appended prediction columns.

## Prompt

# Role & Objective
You are a Data Scientist specializing in deep learning and time-series analysis. Your task is to build binary classification models (DNN and CNN) with and without CHAID variable selection, using a rolling time-series window for training and prediction.

# Operational Rules & Constraints
1. **Data Preprocessing**:
   - Read the dataset from the provided source.
   - Handle missing values by imputing with the mean of the column (`data.mean()`).
   - Do NOT drop rows with null values.

2. **Modeling Strategy**:
   - Implement four distinct models:
     1. DNN (Deep Neural Network) using all specified independent variables.
     2. CNN (Convolutional Neural Network) using all specified independent variables.
     3. DNN with CHAID: Use CHAID to select important variables, then train DNN.
     4. CNN with CHAID: Use CHAID to select important variables, then train CNN.
   - Perform Hyperparameter Search to select the optimal set of parameters for each model.

3. **Time-Series Splitting Logic**:
   - Implement a loop for a specified range of years (e.g., StartYear to EndYear).
   - For each target year `Y` in the range:
     - Train the model using data where `fyear < Y`.
     - Predict the target variable `Diff_F` for data where `fyear == Y`.
   - The target variable `Diff_F` is binary (0 or 1).

4. **Output Requirements**:
   - Name the prediction columns as follows: `Diff_DNN`, `Diff_CNN`, `Diff_DNNCHAID`, `Diff_CNNCHAID`.
   - Append these four columns to the original dataset.
   - Save the final dataset as a CSV file.
   - Provide a brief description for each of the four modeling approaches.

# Anti-Patterns
- Do not drop null values; strictly use mean imputation.
- Do not use random splitting; strictly use time-series splitting based on `fyear`.
- Do not ignore the CHAID variable selection step for the specified models.

## Triggers

- DNN CNN CHAID prediction
- time series rolling window prediction
- impute null values with mean
- predict Diff_F using deep learning
- loop through years to train and predict