Thanks once again to Kit Baum, a new version of the bspline package is now available for download from SSC. In Stata, use the ssc command to do this, or adoupdate if you already have an old version of bspline.
The bspline package is described as below on my website. The new version has an updated version of the manual bspline.pdf.
Best wishes
Roger
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package bspline from http://www.rogernewsonresources.org.uk/stata16
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TITLE
bspline: Create a basis of B-splines or reference splines
DESCRIPTION/AUTHOR(S)
The bspline package contains 3 commands, bspline, frencurv
and flexcurv. bspline generates a basis of B-splines in the
X-variate based on a list of knots, for use in the design
matrix of a regression model. frencurv generates a basis of
reference splines, for use in the design matrix of a
regression model, with the property that the parameters
fitted will be values of the spline at a list of reference
points. flexcurv is an easy-to-use version of frencurv, and
generates reference splines with regularly-spaced knots, or
with knots interpolated between the reference points.
frencurv and flexcurv have the additional option of
generating an incomplete basis of reference splines, which
can be completed by the addition of the standard constant
variable used in regression models. The splines are either
given the names in the newvarlist (if present), or (more
usually) generated as a list of numbered variables, prefixed
by the generate() option. Usually (but not always), the
regression command is called using the noconst option.
Author: Roger Newson
Distribution-date: 17 August 2022
Stata-version: 16
INSTALLATION FILES (click here to inst
> all)
bspline.ado
bspline.sthlp
frencurv.ado
frencurv.sthlp
flexcurv.ado
flexcurv.sthlp
ANCILLARY FILES (click here to get)
bspline.pdf
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(click here to return to the previous screen)
The bspline package is described as below on my website. The new version has an updated version of the manual bspline.pdf.
Best wishes
Roger
-----------------------------------------------------------------------
package bspline from http://www.rogernewsonresources.org.uk/stata16
-----------------------------------------------------------------------
TITLE
bspline: Create a basis of B-splines or reference splines
DESCRIPTION/AUTHOR(S)
The bspline package contains 3 commands, bspline, frencurv
and flexcurv. bspline generates a basis of B-splines in the
X-variate based on a list of knots, for use in the design
matrix of a regression model. frencurv generates a basis of
reference splines, for use in the design matrix of a
regression model, with the property that the parameters
fitted will be values of the spline at a list of reference
points. flexcurv is an easy-to-use version of frencurv, and
generates reference splines with regularly-spaced knots, or
with knots interpolated between the reference points.
frencurv and flexcurv have the additional option of
generating an incomplete basis of reference splines, which
can be completed by the addition of the standard constant
variable used in regression models. The splines are either
given the names in the newvarlist (if present), or (more
usually) generated as a list of numbered variables, prefixed
by the generate() option. Usually (but not always), the
regression command is called using the noconst option.
Author: Roger Newson
Distribution-date: 17 August 2022
Stata-version: 16
INSTALLATION FILES (click here to inst
> all)
bspline.ado
bspline.sthlp
frencurv.ado
frencurv.sthlp
flexcurv.ado
flexcurv.sthlp
ANCILLARY FILES (click here to get)
bspline.pdf
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(click here to return to the previous screen)
