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Calculate the slope of a Deming regression in Spotfire?

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I'm performing some modelling and have 6 columns (3 in X (x1,x2,x3), 3 in Y (y1,y2,y3)) each with thousands of rows. For each row I want to calculate the slope of the Deming regression of the X and Y values and output it to a new column.

I'm brand new to Python/R - wanting to start to pick it up but I need to solve this problem a little sooner than I will be able to myself.

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