fix: corrected formula for changes (#4336)

Author: jpaten

analytics/analytics_package/analytics/sheets_elements.py

@@ -230,8 +230,9 @@ def get_change(series_current, series_previous, start_current, end_current, star
     current_length = float((dt.datetime.fromisoformat(end_current) - dt.datetime.fromisoformat(start_current)).days + 1)
     previous_length = float((dt.datetime.fromisoformat(end_previous) - dt.datetime.fromisoformat(start_previous)).days + 1)
     assert current_length != 0 and previous_length != 0
+    print("current, previous", current_length, previous_length)
     series_current_reindexed = series_current.reindex(combined_index).fillna(0)
     # Adjust the values from the prior series to account for the different number of days in the month
     series_previous_reindexed = (series_previous.reindex(combined_index) * current_length / previous_length)
-    change = ((series_previous_reindexed / series_current_reindexed) - 1).replace({np.inf: np.nan})
+    change = ((series_current_reindexed / series_previous_reindexed) - 1).replace({np.inf: np.nan})
     return change