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ArcologyDesigns

MS Excel: Normal Distributions and Bell Curves

50,874 views 1 year ago
Document Link: http://arcologydesigns.com/...
What are bin numbers: http://en.allexperts.com/q/...

Bin Formulas:
C2=$B$2-3*$B4
C3=C2+$B$4

Then click and drag on the fill handle of cell C3 and drag until you have 8 bin numbers.

"Bin numbers represent the intervals that you want the Histogram tool to use for measuring the input data in data analysis. When you use the Histogram tool, Excel counts the number of data points in each data bin. A data point is included in a particular bin if the number is greater than the lowest bound and equal to or less than the greatest bound for the data bin. If you omit the bin range, Excel creates a set of evenly distributed bins between the minimum and maximum values of the input data."

Other Formulas:
=AVERAGE(A2:A19)
=STDEV(A2:A19)

This video provides a walk-through of how to create a bell curve in Microsoft Excel. It is meant for educational purposes only.

Given a set of data, we normalize it by using Excel's Random Number Generator to create several thousand random values within the parameters of the original data set. A good sample consists of several hundred values - that is when the Law of Large Numbers takes effect. However, that's not always possible. Here, we have a small sample size and need see the bell curve of the data in order to perform statistical analysis for normally distributed data.

The problem lies in the fact that the original data does not appear to be normally distributed. The small sample size misrepresents the true behavior of the population data, which should be normally distributed. To correct for this, we generate 2000 random values and then compare the histograms of both the original data and the randomly generated numbers within the parameters established by or original data set.

We first calculate the average and the standard deviation of our data. Then, we go to File, Options, Add-Ins, and add the Analysis Toolkit, which we use for the random generator and our histograms. Next, we calculate the bin values: our upper and lower limits on our data that Excel will use in the histogram. After generating the random numbers and creating our histograms, we create our bell curves by inserting a scatter plot with smooth lines and compare our results between the original and random data sets.

Send us a message if you have any questions, we're happy to help!

On-line data analysis and research tools:
http://youtu.be/j6K9rk_5A74
______________________________­______________________________­____________

ArcologyDesigns: http://www.arcologydesigns.com
BCB Energy, LLC: http://www.bcb-energy.com

For free IT sample files, go to:
www.bcb-energy.com
and click on "IT Training Initiative," then go to the "download sample files" page.
______________________________­______________________________­____________

100% ALL original content - photos, music, lyrics, art and more!

BCB Energy, LLC and its subsidiary ArcologyDesigns are the sole creators and owners to all artwork, photographs, illustrations, graphics, logos, lyrics, texts, materials, sound recordings and musical compositions and all features of the content and materials. This includes but is not limited to the design, assortment, arrangement, atmosphere and presentation and any associated copyrights or trademarks of such content and materials.
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Document Link: http://arcologydesigns.com/...
What are bin numbers: http://en.allexperts.com/q/...

Bin Formulas:
C2=$B$2-3*$B4
C3=C2+$B$4

Then click and drag on the fill handle of cell C3 and drag until you have 8 bin numbers.

"Bin numbers represent the intervals that you want the Histogram tool to use for measuring the input data in data analysis. When you use the Histogram tool, Excel counts the number of data points in each data bin. A data point is included in a particular bin if the number is greater than the lowest bound and equal to or less than the greatest bound for the data bin. If you omit the bin range, Excel creates a set of evenly distributed bins between the minimum and maximum values of the input data."

Other Formulas:
=AVERAGE(A2:A19)
=STDEV(A2:A19)

This video provides a walk-through of how to create a bell curve in Microsoft Excel. It is meant for educational purposes only.

Given a set of data, we normalize it by using Excel's Random Number Generator to create several thousand random values within the parameters of the original data set. A good sample consists of several hundred values - that is when the Law of Large Numbers takes effect. However, that's not always possible. Here, we have a small sample size and need see the bell curve of the data in order to perform statistical analysis for normally distributed data.

The problem lies in the fact that the original data does not appear to be normally distributed. The small sample size misrepresents the true behavior of the population data, which should be normally distributed. To correct for this, we generate 2000 random values and then compare the histograms of both the original data and the randomly generated numbers within the parameters established by or original data set.

We first calculate the average and the standard deviation of our data. Then, we go to File, Options, Add-Ins, and add the Analysis Toolkit, which we use for the random generator and our histograms. Next, we calculate the bin values: our upper and lower limits on our data that Excel will use in the histogram. After generating the random numbers and creating our histograms, we create our bell curves by inserting a scatter plot with smooth lines and compare our results between the original and random data sets.

Send us a message if you have any questions, we're happy to help!

On-line data analysis and research tools:
http://youtu.be/j6K9rk_5A74
______________________________­______________________________­____________

ArcologyDesigns: http://www.arcologydesigns.com
BCB Energy, LLC: http://www.bcb-energy.com

For free IT sample files, go to:
www.bcb-energy.com
and click on "IT Training Initiative," then go to the "download sample files" page.
______________________________­______________________________­____________

100% ALL original content - photos, music, lyrics, art and more!

BCB Energy, LLC and its subsidiary ArcologyDesigns are the sole creators and owners to all artwork, photographs, illustrations, graphics, logos, lyrics, texts, materials, sound recordings and musical compositions and all features of the content and materials. This includes but is not limited to the design, assortment, arrangement, atmosphere and presentation and any associated copyrights or trademarks of such content and materials. Show less

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