This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

BestFit

BestFit
is a possible value for the RegressionReport option which represents the fitted function.
Needs["LinearRegression`"]
Sample data:
In[2]:=
Click for copyable input
BestFit for a linear regression:
In[3]:=
Click for copyable input
Out[3]=