chore: refine github copilot instructions

Signed-off-by: Jérôme Benoit <jerome.benoit@sap.com>

diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 8e4743f7cdb3bdd0c2c78ded5aaa19f10db064f6..6e9e0f7fd42cdce073dcf67e7e4cb2db9a24f0e6 100644 (file)
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -24,6 +24,7 @@ These instructions guide GitHub Copilot to generate changes consistent with this
 
 ## Statistical conventions
 
+- **Hypothesis testing**: use a single test statistic (e.g., t-test) when possible.
 - **Divergence metrics**: document direction explicitly (e.g., KL(A||B) vs KL(B||A)); normalize distributions; add epsilon to avoid numerical issues.
 - **Effect sizes**: report alongside test statistics and p-values; use standard formulas; document directional interpretation.
 - **Distribution comparisons**: use multiple complementary metrics (parametric and non-parametric).