diff --git a/models/schema/customer.py b/models/schema/customer.py
index 11bf7aa9..3be4c89a 100644
--- a/models/schema/customer.py
+++ b/models/schema/customer.py
@@ -163,23 +163,6 @@ class CustomerAddressResponse(BaseModel):
         "from_attributes": True
     }
 
-
-# ============================================================================
-# Customer Statistics
-# ============================================================================
-
-class CustomerStatsResponse(BaseModel):
-    """Schema for customer statistics."""
-
-    customer_id: int
-    total_orders: int
-    total_spent: Decimal
-    average_order_value: Decimal
-    last_order_date: Optional[datetime]
-    first_order_date: Optional[datetime]
-    lifetime_value: Decimal
-
-
 # ============================================================================
 # Customer Preferences
 # ============================================================================
diff --git a/models/schema/order.py b/models/schema/order.py
index 4c290778..6d34e9ef 100644
--- a/models/schema/order.py
+++ b/models/schema/order.py
@@ -152,19 +152,3 @@ class OrderListResponse(BaseModel):
     total: int
     skip: int
     limit: int
-
-
-# ============================================================================
-# Order Statistics
-# ============================================================================
-
-class OrderStatsResponse(BaseModel):
-    """Schema for order statistics."""
-    total_orders: int
-    pending_orders: int
-    processing_orders: int
-    shipped_orders: int
-    delivered_orders: int
-    cancelled_orders: int
-    total_revenue: Decimal
-    average_order_value: Decimal
diff --git a/models/schema/stats.py b/models/schema/stats.py
index 95ac9a26..0bdf9b65 100644
--- a/models/schema/stats.py
+++ b/models/schema/stats.py
@@ -1,4 +1,5 @@
 import re
+from decimal import Decimal
 from datetime import datetime
 from typing import List, Optional
 
@@ -20,3 +21,45 @@ class MarketplaceStatsResponse(BaseModel):
     total_products: int
     unique_vendors: int
     unique_brands: int
+
+# ============================================================================
+# Customer Statistics
+# ============================================================================
+
+class CustomerStatsResponse(BaseModel):
+    """Schema for customer statistics."""
+
+    customer_id: int
+    total_orders: int
+    total_spent: Decimal
+    average_order_value: Decimal
+    last_order_date: Optional[datetime]
+    first_order_date: Optional[datetime]
+    lifetime_value: Decimal
+
+
+# ============================================================================
+# Order Statistics
+# ============================================================================
+
+class OrderStatsResponse(BaseModel):
+    """Schema for order statistics."""
+    total_orders: int
+    pending_orders: int
+    processing_orders: int
+    shipped_orders: int
+    delivered_orders: int
+    cancelled_orders: int
+    total_revenue: Decimal
+    average_order_value: Decimal
+
+# ============================================================================
+# Vendor Statistics
+# ============================================================================
+
+class VendorStatsResponse(BaseModel):
+    """Vendor statistics response schema."""
+    total: int = Field(..., description="Total number of vendors")
+    verified: int = Field(..., description="Number of verified vendors")
+    pending: int = Field(..., description="Number of pending verification vendors")
+    inactive: int = Field(..., description="Number of inactive vendors")
\ No newline at end of file
diff --git a/tests/unit/services/test_admin_service.py b/tests/unit/services/test_admin_service.py
index b03bd377..01b9374a 100644
--- a/tests/unit/services/test_admin_service.py
+++ b/tests/unit/services/test_admin_service.py
@@ -10,6 +10,7 @@ from app.exceptions import (
     AdminOperationException,
 )
 from app.services.admin_service import AdminService
+from app.services.stats_service import stats_service
 from models.database.marketplace_import_job import MarketplaceImportJob
 from models.database.vendor import Vendor
 
@@ -227,7 +228,7 @@ class TestAdminService:
     # Statistics Tests
     def test_get_user_statistics(self, db, test_user, test_admin):
         """Test getting user statistics"""
-        stats = self.service.get_user_statistics(db)
+        stats = get_user_statistics(db)
 
         assert "total_users" in stats
         assert "active_users" in stats
@@ -244,7 +245,7 @@ class TestAdminService:
 
     def test_get_vendor_statistics(self, db, test_vendor):
         """Test getting vendor statistics"""
-        stats = self.service.get_vendor_statistics(db)
+        stats = stats_service.get_vendor_statistics(db)
 
         assert "total_vendors" in stats
         assert "active_vendors" in stats
@@ -291,7 +292,7 @@ class TestAdminService:
 
     def test_user_statistics_empty_database(self, empty_db):
         """Test user statistics when no users exist"""
-        stats = self.service.get_user_statistics(empty_db)
+        stats = stats_service.get_user_statistics(empty_db)
 
         assert stats["total_users"] == 0
         assert stats["active_users"] == 0
@@ -300,7 +301,7 @@ class TestAdminService:
 
     def test_vendor_statistics_empty_database(self, empty_db):
         """Test vendor statistics when no vendors exist"""
-        stats = self.service.get_vendor_statistics(empty_db)
+        stats = stats_service.get_vendor_statistics(empty_db)
 
         assert stats["total_vendors"] == 0
         assert stats["active_vendors"] == 0