This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.

# Regress

 Regress[data, funs, vars]finds a least-squares fit to a list of data as a linear combination of the functions funs of variables vars.
• The data can have the form {{x1, y1, ..., f1}, {x2, y2, ..., f2}, ...}, where the number of coordinates x, y, ... is equal to the number of variables in the list vars.
• The data can also be of the form {f1, f2, ...}, with a single coordinate assumed to take values 1, 2, ....
• The argument funs can be any list of functions that depend only on the variables vars.
• Regress returns a list of rules for results and diagnostics specified by the option RegressionReport.
• Regress always finds the linear combination of the functions in the list funs that minimize the sum of the squares of deviations from the values fi.
• Exact numbers given as input to Regress are converted to approximate numbers with machine precision.
• The following options can be given:
 RegressionReport SummaryReport results to be included in output IncludeConstant True whether to automatically include a constant as one of the functions BasisNames Automatic names of basis elements for table headings Weights Automatic weights for each data point Method Automatic method used to compute singular values Tolerance Automatic tolerance to use in computing singular values ConfidenceLevel 0.95 confidence level used for confidence intervals
• With the option , Regress gives the same fit as Fit does.
• Possible settings for Weights are Automatic, a list of numbers with the same length as the data, or a pure function.
• With the default setting , each data point is given a weight of 1.
Needs["LinearRegression`"]
Linear regression for a straight line:
 Out[2]=

Needs["LinearRegression`"]
Linear regression for a constant plus a sinusoid:
 Out[2]=
 Options   (6)