diff --git a/src/moments/variance0.rs b/src/moments/variance0.rs
index 099bf38..5913bad 100644
--- a/src/moments/variance0.rs
+++ b/src/moments/variance0.rs
@@ -1,7 +1,3 @@
-use crate::matrix_variance_mean::Mean;
-use average::Estimate;
-use average::Merge;
-
 const ddof: f64 = 0.;
 
 /// Estimate the arithmetic mean and the variance of a sequence of numbers
diff --git a/src/moments/variance1.rs b/src/moments/variance1.rs
index d2eb8f9..e401c30 100644
--- a/src/moments/variance1.rs
+++ b/src/moments/variance1.rs
@@ -1,7 +1,3 @@
-use crate::matrix_variance_mean::Mean;
-use average::Estimate;
-use average::Merge;
-
 const ddof: f64 = 1.;
 
 /// Estimate the arithmetic mean and the variance of a sequence of numbers