diff --git a/stats/correlation.py b/stats/correlation.py
index d8a9811..f6003d6 100644
--- a/stats/correlation.py
+++ b/stats/correlation.py
@@ -27,8 +27,7 @@ def _ensure_int_bytes(df: pd.DataFrame, cols: list) -> pd.DataFrame:
     return df
 
 def calculate_correlation(df: pd.DataFrame, method: str, target_id: str | None = None) -> pd.DataFrame:
-    byte_cols = [f"b{i}" for i in range(8) if f"b{i}" in df.columns]
-    available_cols = [col for col in byte_cols if col in df.columns]
+    available_cols = [f"b{i}" for i in range(8) if f"b{i}" in df.columns]
 
     if not available_cols:
         raise ValueError("No byte columns (b0-b7) found in the DataFrame")
diff --git a/stats/entropy.py b/stats/entropy.py
index 11d053b..df42d15 100644
--- a/stats/entropy.py
+++ b/stats/entropy.py
@@ -36,8 +36,7 @@ def _entropy_col(a: np.ndarray) -> float:
     return float(-np.sum(p * np.log2(p)))
 
 def calculate_byte_entropy(df: pd.DataFrame) -> pd.DataFrame:
-    byte_cols = [f"b{i}" for i in range(8) if f"b{i}" in df.columns]
-    available_cols = byte_cols
+    available_cols = [f"b{i}" for i in range(8) if f"b{i}" in df.columns]
     if not available_cols:
         raise ValueError("No byte columns (b0-b7) found in the DataFrame")