when do i use rdd difference between parametric and nonparametric regression discontinuity design which regression design approach does the user-written treatment affect what is the difference between parametric and nonparametric regression? what is local linear regression which of the following is a nonparametric approach to regression discontinuity design? what is the parametric approach to regression how to do regression discontinuity design what is the difference between parametric vs nonparametric regression which approach is more accurate the rd lne approach or nonparametric method? how to get rd in stata what is the difference between a nonparametric and a parametric approach? which is a different approach to regression discontinuity design (rdd)? which of these is a parametric approach to rdd analysis? what is the local linear regression approach what is the local linear approach for regression what is the local linear approach of regression discontinuity design rdd definitions and examples what is the difference between parametric and nonparametric regression what is nonparametric approach to regression