[P3][Phase-3][document] Issue 4.3: Data Split Methodology Unclear

[matercomus]

Metadata

• Priority: P3-Minor
• Phase: Phase 3 (Week 3)
• Feasibility: document
• Category: documentation
• Effort: 1 hour
• Dependencies: None

Problem Statement

Train/validation/test split methodology not clearly documented. Split ratios, temporal considerations, stratification unclear.

Evidence

Code: Splits performed
Documentation: Methodology not detailed

Required Changes

1. Document split ratios (e.g., 70/15/15)
2. Explain split strategy (random, temporal, stratified)
3. Document if temporal ordering preserved
4. Explain rationale for chosen strategy
5. Document any special considerations

Validation Steps

• Split ratios documented
• Strategy explained
• Temporal considerations noted
• Rationale provided
• Special cases documented

Files to Modify

• docs/DATASET_SETUP.md
• Data preprocessing documentation
• Methods section

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Reference: docs/implementation-review-remeditation/IMPLEMENTATION_REMEDIATION_REPORT.md - Issue 4.3
Roadmap: Phase 3 - Week 3 (1 hour)