Plotting a proper best-fit line is about balance, not just connecting points. You must judge the line so points are evenly scattered above and below it, then calculate its gradient using points on the line itself, not your data. My joy is tuning my Tanpura by ear to find the true centre of a note, not just tightening until the string *sngewbha*—it’s the same principle of seeing the whole picture, not forcing a line through extremes.
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