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How to overlay a Gaussian distribution curve over a frequency distribution (histogram) in Excel 2007?

Posted on 2010-08-16
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I have support groups and am capturing their monthly ticket counts by analyst in each group.  I am trying to show the relationship between the analysts average for a year against the groups' average for the year.  This gets updated every month.

I've been asked to plot the average for each analyst against the mean for the group and each standard deviation out to 4 from the mean.  So far, I have been able to create a histogram for a sample group and also a distribution curve for the mean and deviations.  But I can't marry the two types.  I have also  tried to create an X-Y Plot graph using the analyst means (not shown) but don't know how to overlay the curve.  I believe the point is to show which groups tend to have normal distrubutions and which have non-normal ones.

I believe what I'm looking for is similar to this:
http://www.graphpad.com/help/prism5/prism5help.html?graphing_frequency_distribution_histograms_with_prism.htm

Attached is a sample group with charts so far.  This group clearly not normally distrubuted.  I've researched EE and other Excel sites and this seems to be a fairly common question but I haven't been able to apply any of the specific solutions.
GroupSample-081610.xlsx
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Question by:shadowbreeze
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LVL 17

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calacuccia earned 2000 total points
ID: 33465303
Hello

Attached you'll find your workbook with an example of how to combine a generated normal distribution with the calculated histogram, on a X-Y chart, where the normal distribution is plotted as a solid smooth curve and the histogram is repolotted (and rescaled to fit well) as points with Y-error bars going down to the x-axis and maximally increased in size to make it look more or less as a line graph.

This is in my opinion the only way to achieve what you're looking for, I think it resolves your issue.

Good luck & HTH
GroupSample-081610-1-.xlsx
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Author Closing Comment

by:shadowbreeze
ID: 33468657
The good news is the solution answers my question exactly.  The bad news is I think I need to review the results and ask a different question.  Thanks.
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LVL 17

Expert Comment

by:calacuccia
ID: 33469189
I'm sorry to hear about the bad news, but let's see your next question, I'll try to be of help again.
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