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I have a set of data, two columns, and each datum has its measurement error like illustration shows below:

x | y

--------------|-----------------

x1+/-xe1 | y1+/-ye1

. | .

. | .

-------------------------------

Now, I intend to find a best fitting line with those data.

I just ask where I can find the sources or exact formulae that I can

calculate the slope and the intercept even the slope variance and intercept variance.

Thank you so much,

Han