Al Kadiri, M.; Carroll, R.J.; Wand, M.P. - In: Statistics & Probability Letters 80 (2010) 15-16, pp. 1242-1252
We study the marginal longitudinal nonparametric regression problem and some of its semiparametric extensions. We point out that, while several elaborate proposals for efficient estimation have been proposed, a relative simple and straightforward one, based on penalized splines, has not. After...