Chart that Auto Updates with a Dynamic Range of only the last 30 observations

[bthome0826]

I'm looking to create a line chart that automatically updates when a new row of data is entered, but I only want the line chart to display the last 30 data points from the column titled "Error (Bias)"

Is this possible to create using Excel? I am using a Windows PC and Excel 365.

 

[petertenthije]

You can if you work with named ranges.

Go on the main ribbon to FORMULAS, and then NAME MANAGER. On the pop-up menu select NEW.

Type in a name for the range, without spaces. For instance "DataForGraph1".

In the refers to box, type the following formula:
=INDIRECT("'Sheet3'!$A$"&COUNTA(Sheet3!$A:$A)-29&":$A$"&COUNTA(Sheet3!$A:$A))

This assumes your data is in Sheet3, column A... so you will need to change that yourself.
Also, note that the formula begins with an quotation mark (") and an apostrophe (')!

Now create a new graph.
Click on ADD to create a new range, and instead of selecting a range of data, type the name of the workbook plus the named range you just created seperated by an exclamation mark. For instance:
=Book2.xlsx!DataForGraph1

Lastly, this assumes there are no empty cells in your data range!