pan class='op'>)</span>,
                   <span class='fu'><a href='https://rdrr.io/r/splines/ns.html'>ns</a></span><span class='op'>(</span><span class='va'>nd</span><span class='op'>$</span><span class='va'>x</span>, df <span class='op'>=</span> <span class='va'>degree</span>, knots <span class='op'>=</span> <span class='va'>knots</span>,
                      Boundary.knots <span class='op'>=</span> <span class='va'>Boundary.knots</span><span class='op'>)</span><span class='op'>)</span>
<span class='va