dear r-help. i want top report a mistake in the documentation help(splineDesign). the last sentence of "value" is " Each B-spline is defined by a set of 'ord' successive knots so the total number of B-splines is 'length(knots)-ord'. " it is not correct! one b-spline is defines by a set of 'ord+1' successive knots. take an easy example: degree 0 is a constant spline it has order 1 and you need 2 knots to define the boundaries do i have to report to somebody else? yours sincerely, michael kobl (dipl. math.) [[alternative HTML version deleted]]