e> methods adapted to the class attributes of the <code>tvReg</code>. In addition, it includes bandwidth selection methods, time-varying variance-covariance estimators and four estimation procedures: the time-varying ordinary least squares, which are implemented in the <code><a href="reference/tvOLS.html">tvOLS()</a></code> methods, the time-varying generalised least squares for a list of equations, which is implemented in the <code><a href="reference/tvGLS.html">tvGLS()</a></code> methods, time-varying poo