How to calculate Difference for two year in a Pivot Table using a Forumlas

I have a Pivot table that has the rows as users Columns label is Date (Year) and Sum of Values,
Values are sum per user for Bills and Sum per user Paid.


Pivot Img
I need to calculate the difference between 2012 - 2013 paid as well as 2012 - 2013 Billed.

I see there is a Difference From option as well as using formulas.

Should I just do the calculation outside the PivotTable?
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yo_beeDirector of Information TechnologyAsked:
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cybermanoj4uCommented:
While pivot tables are very useful features for analyzing and explaining data in Excel, they can also be confusing to work with. Some functions, such as calculating differences, must be accomplished in a certain way if they are to work correctly. The process is not well explained within Excel's help feature, so here's how to calculate difference in pivot tables without using extraneous formulas. Below are the steps.

Steps

> Launch Microsoft Excel.
> Open the spreadsheet containing the pivot table and source data you are working with.
> Select the worksheet tab containing the source data.
> Determine the calculation you would like to add.
> Insert a column for the calculated difference amounts.
> For instance, assume you want your pivot table to include a field showing the difference between column G and column H and both columns contain numerical fields.
> Right-click on column I and choose "Insert Column" from the pop-up menu. A column will be inserted to the right of column H and all columns of data beyond that column will be shifted one place to the right.
> Enter a name for the column such as "Difference."
> Create a formula in the first cell of your new column to calculate your differences.
> Make sure you choose the correct syntax for your formula to return a positive or negative number as desired.
> Copy and paste the formula through the rest of the new column.
> Click on the ¿worksheet tab containing your pivot table, if it is different from the location of your source data.
> Alter the source data for your pivot table
> In Excel 2003, relaunch the pivot table wizard utility by clicking inside the pivot table and choosing "Wizard" from the pop-up menu.
> In Excel 2007 or 2010, click the "Change Source Data" button on the Pivot Tools Options tab.
> Either click and drag to highlight a new range or simply edit the range formula already in the "Range" field to include the following column.
> Refresh your pivot table by clicking the "Refresh" button.
> Add the difference column to your pivot table by clicking the column name, dragging it and dropping it into the "Values" field of the pivot table wizard.
> You may need to reorder the column names in the "Values" section to make the columns appear in your pivot table in the correct order. You can click and drag from the "Values" section or directly within the pivot table to rearrange the order of your columns


Source for More Information

http://office.microsoft.com/en-us/excel-help/pivottable-reports-101-HA001034632.aspx
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helpfinderIT ConsultantCommented:
if you use some column outside of the pivot with formulas and references to the Pivot table cells in these formulas then you should calculate it without any problem
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yo_beeDirector of Information TechnologyAuthor Commented:
All columns being references are within the PivotTable.
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helpfinderIT ConsultantCommented:
do you mean like this? (attached sample)
Book1.xlsx
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yo_beeDirector of Information TechnologyAuthor Commented:
Yes
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yo_beeDirector of Information TechnologyAuthor Commented:
Note: My dates are Grouped by Year, Month
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helpfinderIT ConsultantCommented:
OK, but in your screen I see only years - if you need to apply specificely to you your case, please attach your data (or sample) to check
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yo_beeDirector of Information TechnologyAuthor Commented:
attached is the file
Book1.xlsx
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helpfinderIT ConsultantCommented:
Hi, so now I extracted year from your dates and created pivot based on year
Check attachments. (2 versions attached)
Copy-of-Book1.xlsx
Copy-of-Book2.xlsx
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yo_beeDirector of Information TechnologyAuthor Commented:
@HelpFinder:

That is what I was hoping to avoid. I want to use the Formula tool to create a field within the pivot table.
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yo_beeDirector of Information TechnologyAuthor Commented:
I was not able to get to the final result from your solution, but it pointed me in the right direction.

Found what I was looking for.


I needed to Drag the Fees Bill Field and change it from sum to show value as, Selected the option Difference From and where I was going wrong before was choosing my base field

I just need to select Years (from the grouping) then Previous and it worked.

Thanks for the effort guys, but
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