\begin{tabular}{@{}l*{3}{l}@{}}
\hline
  &\multicolumn{2}{l}{M1  }\tabularnewline
 &\multicolumn{1}{c}{Estimate}&\multicolumn{1}{c}{(S.E.)}\tabularnewline
 \hline
 \hline
  (Intercept) & 0.487 & (5.047) \tabularnewline
  x & 0.289** & (0.095) \tabularnewline
 \hline
 N&\multicolumn{1}{l}{100}  & \tabularnewline
 RMSE&10.749\tabularnewline
 $R^2$&0.087\tabularnewline
 \hline
\hline
 
 \multicolumn{3}{l}{  ${*  p}\le 0.05$${*\!\!*  p}\le 0.01$${*\!\!*\!\!*  p}\le 0.001$}\tabularnewline
 \end{tabular}