Calibration Curve Fit Assistant


I was wanting to utilize the Curve Fit Assistant for optimizing my calibration curve. I know that I want to use a quadratic fit from my regression analysis, and Curve Fit Assist agrees. It also recommended adding a 1/SD^2 weight to my curve. Can someone help me to understand how this weight is being calculated? I like that the 1/SD^2 is adjusting my y-intercept without having to force any origins. 

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