diff --git a/skyline/analyzer/algorithms.py b/skyline/analyzer/algorithms.py
index ee3b70a4..9c415273 100644
--- a/skyline/analyzer/algorithms.py
+++ b/skyline/analyzer/algorithms.py
@@ -412,14 +412,14 @@ def record_algorithm_error(algorithm_name, traceback_format_exc_string):
         return False
 
 
-def determine_median(array):
+def determine_median(timeseries):
     """
-    Determine the median in an array of values
+    Determine the median of the values in the timeseries
     """
 
     # logger.info('Running ' + str(get_function_name()))
     try:
-        np_array = np.array(array)
+        np_array = pandas.Series([x[1] for x in timeseries])
     except:
         return False
     try:
diff --git a/skyline/analyzer_dev/algorithms_dev.py b/skyline/analyzer_dev/algorithms_dev.py
index 6a14a74e..ee0e7832 100644
--- a/skyline/analyzer_dev/algorithms_dev.py
+++ b/skyline/analyzer_dev/algorithms_dev.py
@@ -328,14 +328,14 @@ def ks_test(timeseries):
         return None
 
 
-def determine_median(array):
+def determine_median(timeseries):
     """
-    Determine the median in an array of values
+    Determine the median of the values in the timeseries
     """
 
     # logger.info('Running ' + str(get_function_name()))
     try:
-        np_array = np.array(array)
+        np_array = pandas.Series([x[1] for x in timeseries])
     except:
         return False
     try:
diff --git a/skyline/mirage/mirage_algorithms.py b/skyline/mirage/mirage_algorithms.py
index 2d4dd8be..a07a5f59 100644
--- a/skyline/mirage/mirage_algorithms.py
+++ b/skyline/mirage/mirage_algorithms.py
@@ -389,14 +389,14 @@ def record_algorithm_error(algorithm_name, traceback_format_exc_string):
         return False
 
 
-def determine_median(array):
+def determine_median(timeseries):
     """
-    Determine the median in an array of values
+    Determine the median of the values in the timeseries
     """
 
     # logger.info('Running ' + str(get_function_name()))
     try:
-        np_array = np.array(array)
+        np_array = pandas.Series([x[1] for x in timeseries])
     except:
         return False
     try: