Tips and Tricks
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ipavlova
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Quote ipavlova Replybullet Topic: Average of Average
    Posted: 02 Jun 2012 at 8:58pm
Hi,

I have a summary fields that include the Average score of users.

What i need to do is do an Average of these  fields (i mean average of all users score).
 
The data is  like this:
Group of learners "New hires":
Learner 1
     Test 1 score: 20
     Test 2 score : 50
                     average: 35   - for this fields i use RTotal field
 
Learner 2
    Test 1 score: 20
    Test 2 score : 100
    Test 3 score: 30
                   average: 50 
 
And the result  must be: Average for all users: 42,5
                                      
 
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hilfy
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Quote hilfy Replybullet Posted: 11 Jun 2012 at 5:15am
You can't do an average of an average - it's an invalid statistic.  I assume  that you're doing the averages by group for what you have.  What you need to do to get the final average is run the average as a Grand Total instead of by group.  This will sum the scores for all records and divide by the total number of scores on the report.
 
-Dell
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rkrowland
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Quote rkrowland Replybullet Posted: 11 Jun 2012 at 5:27am
I still wouldn't even try and take an average of an average even if there is a method that allows it - it's a meaningless number, the average test score in your example is 44, not 42.5.
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comatt1
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Quote comatt1 Replybullet Posted: 31 Aug 2012 at 5:55am
I would weight the scores, then average, like if new then score x2 and if old scorex1 or something
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