Quadratic MS Cal Curve Forced Through Origin R-squared

Hi All,

Using OLCDS 2.7.0. 

Creating a quadratic MS cal curve forced through origin.

Can not reproduce r-squared value using Excel.

Has anybody encountered the issue with the determination coefficient (r-squared) when making a quadratic cal curve forced through the origin? The math is done slightly differently than in Excel. Is there another software application that will allow me to reproduce this math for a validation?

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