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help for rcs 
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generate restricted cubic spline basis functions

    rcs varname [if] [in , knots(numlist) [gen](stubname) [dgen](stubname)

Description

rcs generates basis functions for restricted cubic splines and (optionally)
their derivatives. The function is assumed linear beyond the two boundary
knots.

Options

kknots(knots) list the knots.

gen(stubname) gives a stubname for the generated cubic splines variables. E.g.
    gen(rcs) will create variable rcs1, rcs2, ...

dgen(stubname) gives a stubname for the derivatives of the cubic spline
    variables. If this option is omitted, the derivatives are not calculated.

Example:

    . rcs x, knots(10 30 50 70 90) gen(rcs)

Authors

Chris Nelson (cn46@le.ac.uk) and Paul Lambert (paul.lambert@le.ac.uk)

Also see