You can do this for any function. You could try the LOGEST function in place of LINEST, or you could transform your data first, then use LINEST on the transformed data. I’ve read about issues with the calculation of sums of squares and errors with transformed data, but I’m not sure where to suggest you find further information.

Check out Error 3 in Trendline Fitting Errors. Then check out the other errors just to be safe.

In Excel 2003 I’d confidently say the limit was probably something like 256 linked textboxes. But I’ve had problems like yours with links to cells updating properly in 2007. I have not yet figured out a viable workaround.

Is there a limit to the number of text boxes you can dynamically link to a chart. I have several stats in a DCF model that I like to show with a cash flow diagram, like IRR, NPV, etc. and I’ve found the easiest way to collect the data is for a separate text box per stat and label linked to individual cells. This way I am able to capture the formatting for each stat and label without going through a VBA solution (this project must remain as uncomplicated as possible for coworkers ;) ).

I currently have 14 text boxes grouped into one object that I paste into my chart. I’d say the first 1/3 update and the last 2/3 fail to update. Does this make any sense? Have you run into this problem before? I am at a loss as to why this is happening and have scoured the internet for answers. BTW many thanks for your great site–it has been very useful to many many people.