Obsolete IDL Features: Routines with Obsolete Arguments or Keywords

REGRESS

The following arguments and keywords to REGRESS are obsolete.

Arguments

Weights

An Npoints-element vector of weights for each equation. For instrumental (Gaussian) weighting, set Weights_i = 1.0/standard_deviation(Y_i)². For statistical (Poisson) weighting, set Weights_i = 1.0/Y_i. For no weighting, set Weights_i = 1.0, and set the RELATIVE_WEIGHT keyword.

Yfit

A named variable that will contain an Npoints-elements vector of calculated values of Y.

Const

A named variable that will contain the constant term.

Sigma

A named variable that will contain the vector of standard deviations for the returned coefficients.

Ftest

A named variable that will contain the value of F for test of fit.

R

A named variable that will contain the vector of linear correlation coefficients.

Rmul

A named variable that will contain the multiple linear correlation coefficient.

Chisq

A named variable that will contain a reduced, weighted, chi-squared.

Status

A named variable that iwll contain the status of the internal array inversion computation.

Keywords

RELATIVE_WEIGHT

If this keyword is set, the input weights (the W vector) are assumed to be relative values, and not based on known uncertainties in the Y vector. Set this keyword in the case of no weighting.

  IDL Online Help (March 06, 2007)