From 77ef1d69235dcd44ea8308062ff134dc8893f176 Mon Sep 17 00:00:00 2001
From: Helmut Merz <helmutm@cy55.de>
Date: Thu, 7 Mar 2013 18:21:06 +0100
Subject: [PATCH] fix calculation: ignore empty groups, fix calculation of
 feedback index

---
 knowledge/survey/README.txt       | 4 ++--
 knowledge/survey/questionnaire.py | 7 ++++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/knowledge/survey/README.txt b/knowledge/survey/README.txt
index de5d807..48545ed 100644
--- a/knowledge/survey/README.txt
+++ b/knowledge/survey/README.txt
@@ -56,6 +56,6 @@ Grouped Feedback Items
   >>> qugroup.feedbackItems = [fi01, fi02, fi03]
 
   >>> res = resp01.getGroupedResult()
-  >>> for fi, score in res:
+  >>> for qugroup, fi, score in res:
   ...     print fi.text, round(score, 2)
-  fi02 1.17
+  fi02 1.75
diff --git a/knowledge/survey/questionnaire.py b/knowledge/survey/questionnaire.py
index 853bfbf..975871d 100644
--- a/knowledge/survey/questionnaire.py
+++ b/knowledge/survey/questionnaire.py
@@ -102,7 +102,8 @@ class Response(object):
                     value = qu.answerRange - value - 1
                 score += value 
                 scoreMax += qu.answerRange - 1
-            relScore = score / scoreMax
-            wScore = relScore * (len(qugroup.feedbackItems) - 1)
-            result.append((qugroup.feedbackItems[int(wScore)], wScore))
+            if scoreMax > 0.0:
+                relScore = score / scoreMax
+                wScore = relScore * len(qugroup.feedbackItems) - 0.00001
+                result.append((qugroup, qugroup.feedbackItems[int(wScore)], wScore))
         return result