NaN-Safe Correlation Computation
Overview
Computing correlations across many features (genes, proteins, variants) when missing values are present is error-prone. The most common mistake is using bulk matrix shortcuts that silently mishandle NaN, producing incorrect correlation values. This guide covers correct per-feature pairwise computation, degenerate input filtering, and performance optimization.
Key Concepts
Pairwise vs Listwise Deletion
- Pairwise deletion: For each fe
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