diff --git a/metcalcpy/util/mode_arearat_statistics.py b/metcalcpy/util/mode_arearat_statistics.py
index 2ca56f8e..18d453cb 100644
--- a/metcalcpy/util/mode_arearat_statistics.py
+++ b/metcalcpy/util/mode_arearat_statistics.py
@@ -902,16 +902,16 @@ def calculate_objacsi(input_data, columns_names):
 
     try:
         nominator_data = column_data_by_name_value(input_data, columns_names, nominator_filter)
-        nominator = sum_column_data_by_name(nominator_data, columns_names, 'area')
+        nominator = sum_column_data_by_name(nominator_data, columns_names, 'area') / 2
 
         denominator_1_data = \
             column_data_by_name_value(input_data, columns_names, denominator_filter_1)
-        denominator_1 = sum_column_data_by_name(denominator_1_data, columns_names, 'area')
+        denominator_1 = sum_column_data_by_name(denominator_1_data, columns_names, 'area') / 2
 
         denominator_2_data = \
             column_data_by_name_value(input_data, columns_names, denominator_filter_2)
         denominator_2 = sum_column_data_by_name(denominator_2_data, columns_names, 'area')
-        result = round_half_up(nominator / (denominator_1 + 2 * denominator_2), PRECISION)
+        result = round_half_up(nominator / (denominator_1 + denominator_2), PRECISION)
     except (TypeError, ZeroDivisionError, Warning, ValueError):
         result = None
     warnings.filterwarnings('ignore')
diff --git a/metcalcpy/util/mode_ratio_statistics.py b/metcalcpy/util/mode_ratio_statistics.py
index 39b7571e..a61d2f28 100644
--- a/metcalcpy/util/mode_ratio_statistics.py
+++ b/metcalcpy/util/mode_ratio_statistics.py
@@ -838,17 +838,17 @@ def calculate_objcsi(input_data, columns_names):
             or None if some of the data values are missing or invalid
     """
     warnings.filterwarnings('error')
-    nominator_filter = {'fcst_flag': 1, 'matched_flag': 0}
+    nominator_filter = {'simple_flag': 1, 'matched_flag': 1}
     denominator_filter_1 = {'simple_flag': 1, 'matched_flag': 1}
     denominator_filter_2 = {'simple_flag': 1, 'matched_flag': 0}
 
     try:
-        nominator = nrow_column_data_by_name_value(input_data, columns_names, nominator_filter)
+        nominator = nrow_column_data_by_name_value(input_data, columns_names, nominator_filter) / 2
         denominator_1 = \
-            nrow_column_data_by_name_value(input_data, columns_names, denominator_filter_1)
+            nrow_column_data_by_name_value(input_data, columns_names, denominator_filter_1) / 2
         denominator_2 = \
             nrow_column_data_by_name_value(input_data, columns_names, denominator_filter_2)
-        result = round_half_up(nominator / (denominator_1 + 2 * denominator_2), PRECISION)
+        result = round_half_up(nominator / (denominator_1 + denominator_2), PRECISION)
     except (TypeError, ZeroDivisionError, Warning, ValueError):
         result = None
     warnings.filterwarnings('ignore')