diff --git a/src/main/df_loader.py b/src/main/df_loader.py
index 0cd77a4..0c8fd0a 100644
--- a/src/main/df_loader.py
+++ b/src/main/df_loader.py
@@ -2,6 +2,7 @@ from datetime import date
 
 import numpy as np
 import pandas as pd
+from numpy import ndarray
 from pandas import DataFrame
 
 from src.main.constants import Constants as const
@@ -10,6 +11,7 @@ from src.main.utils import Utils
 
 
 class DfLoader:
+
     def __init__(self, json_file: str) -> None:
         self.__geocache: Geocache = Geocache()
         print(f'Try to load data from the {json_file} file')
@@ -68,5 +70,6 @@ class DfLoader:
         self.__df['location'] = self.__df['city'] \
             .apply(lambda val: '' if Utils.is_empty_str(val) else self.__geocache.get_location(val))
 
-    def get_clustering_data(self) -> DataFrame:
-        return self.__df
+    def get_clustering_data(self) -> ndarray:
+        columns: [] = ['location', 'sex', 'age', 'is_university', 'is_work', 'is_student', 'is_schoolboy']
+        return self.__df[columns].to_numpy()