# Add empty cells in table in Latex

I want to put some empty cells in Table so my table has the first row with numbers and the next the first cell only empty.

I also used note under the table but there is error that I couldn't resolve.

\begin{table}
\begin{center}
\begin{threeparttable}
\caption{Sample of table}
\begin{tabular}{c | c | c |  c}
\toprule
\textbf{$Set$}  & \textbf{$d_t$}
&\textbf{$d_{mt}$}  & \textbf{$d_{ms}$}
\midrule

A    & 122    &30    & 6.0003\\
&(3)     &(27)  &(5)\\
B    & 150    &26    &4  \\
&(4)     &(2)   &(3)\\
C    & 5      & 1.5  & 1 \\
&(4)     &(1)   &(2)\\

\bottomrule
\end{tabular}
\begin{tablenotes}
\small

• please extent your code fragment to complete small document with your table. in preamble are information which might be source of your problems. in your table the first row is not terminated properly (missed are \) – Zarko Apr 12 at 17:21
• you are missing \\  before the \midrule – David Carlisle Apr 12 at 17:39
• unrelated but \textbf{$d_{ms}$} is the same as $d_{ms}$ as math mode is unaffected by the text font outside the math. Perhaps you intended \boldmath $d_{ms}$ ? – David Carlisle Apr 12 at 19:33