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RC_SPLINE: Stata module to generate restricted cubic splines


  • William D. Dupont

    (Vanderbilt University School of Medicine)

  • W. Dale Plummer, Jr.

    (Vanderbilt University School of Medicine)

Programming Language



rc_spline creates variables that can be used for regression models in which the linear predictor f(xvar) is assumed to equal a restricted cubic spline function of an independent variable xvar. In these regressions, the user explicitly or implicitly specifies k knots located at xvar = t1, t2, ..., tk. f(xvar) is defined to be a continuous smooth function that is linear before t1, is a piecewise cubic polynomial between adjacent knots, and is linear after tk. See Harrell (2001) for additional details.

Suggested Citation

  • William D. Dupont & W. Dale Plummer, Jr., 2004. "RC_SPLINE: Stata module to generate restricted cubic splines," Statistical Software Components S447301, Boston College Department of Economics, revised 14 Jan 2005.
  • Handle: RePEc:boc:bocode:s447301
    Note: This module should be installed from within Stata by typing "ssc install rc_spline". The module is made available under terms of the GPL v3 ( Windows users should not attempt to download these files with a web browser.

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