Trendline curved in wrong direction - actual built-in Excel solution?

VeeRoc

New Member
Joined
May 18, 2021
Messages
1
Office Version
  1. 365
Platform
  1. Windows
We have a data set with data tapering to zero for a facility closure. Is there a way to indicate to Excel that the trendline is another variety of Exponential, curving the other way? Every trendline fit I have tried, Excel either (1) assumes only an upward/increasing trend, as though it does not understand that something could possibly decrease (2) curves it the wrong way. The blue is hand-predicted datapoints, the orange is formula-generated by the equation y=13496.76-96.03672/2^(x/-1.688382). So of course I know what the best fit Trendline is, and have now created a workaround in the process. My question is, is there some setting in Excel that I have neglected, that is forcing it to adopt the orange trendline when there is clearly a much better fit possible? I feel like I am missing something terribly obvious. This adventure started with trying to force an intercept with a forecast trendline curved down with a known end-date, while of course Excel only allows an intercept to be forced on the other axis as far as I have been able to discover. Thanks!

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Excel Facts

Why are there 1,048,576 rows in Excel?
The Excel team increased the size of the grid in 2007. There are 2^20 rows and 2^14 columns for a total of 17 billion cells.

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