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I have a huge spreadsheet with simple data as follows

13:04:28    A
13:04:37    A
13:06:56    B
13:07:03    B
13:07:10    C
13:07:18    C 
13:07:23    C 
13:07:28    C 
13:07:33    C 

Basically timestamp,classification in two columns. i want to plot a pie chart showing the distribution of A,B and C etc by the number of times of their occurrence. How can I do so?

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up vote 2 down vote accepted

You can use countif function to count number of A,B,C and save numbers in other cells. Finally you can use these values to plot your chart....

COUNTIF(range,criteria) ---> for example the expression =COUNTIF(F:F,"A") gives number of "A" in your "F" column Range is the range of cells from which you want to count cells. Criteria is the criteria in the form of a number, expression, cell reference, or text that defines which cells will be counted. For example, criteria can be expressed as 32, "32", ">32", "apples", or B4.

For more information you can see Microsoft Office Help...

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You can also pivot your data, then choose a pie chart from one of your Pivot Chart options. At least, I could in Excel 2007.

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First, you should find the number of occurences for A, B, C, etc. individually. To do that, in a new column, enter the following formulae:

=COUNTIF(B:B,"=A")  
=COUNTIF(B:B,"=B")  
=COUNTIF(B:B,"=C")  
...  

where B is the column where the values to be counted reside.

Then you can insert your pie-chart using those newly calculated values.

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