I would be a bit less generous: the documentation is poor. Abbreviations and symbols should always be explained. Take a look at just about any paper in a refereed journal.

rsq is probably the square of the correlation coefficient. The θ array is probably the coefficients for xi.(Note that that's supposed to be a subscript, but it's rendered, at least in my browser, as a superscript).

emc

e(π√−1) = −1

In reply to Re^3: Calculating the regression equation for a distribution by swampyankee
in thread Calculating your basic $constant, $slope, and $error terms for a time series distribution by tphyahoo

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