Beamer and longtable

Question

I am trying to highlight a row in beamer, but the whole row does not get hihglighted (i.e., there is white space between each column). Is there any way to highlight the entire row by still using the long table? Please also note that there are many other slides, so I had to use many packages that may not seem relevant here. Here is what I have of far:

\documentclass[table,slidestop,compress,mathserif, 10pt]{beamer}
\usetheme{Frankfurt}
\usecolortheme{seahorse}
\usepackage{booktabs, longtable}
\newcommand\mcc[1]{\multicolumn{1}{c}{#1}}
\usepackage{bbm}
\usepackage{array, booktabs, tabularx}
\usepackage{siunitx}

\usepackage[orientation=landscape,size=custom,width=16,height=9,scale=0.5,debug]{beamerposter} 


% The main document
\begin{document}






\setcounter{subsection}{1}
\begin{frame}{Regression}
\vspace{-0.50cm}
\begin{table}[htb]
\footnotesize   

  \begin{tabularx}{\linewidth}{l*{6}{Y}}

     \toprule 
    & \mcc{(I)} & \mcc{(II)} & \mcc{(III)} & \mcc{(IV)} & \mcc{(V)}& \mcc{(VI)}   \\\hline 
\rowcolor{blue!20} $\mathbbm{1}$(Hosp$_{i})\times\mathbbm{1}$(Doc$_{t}$)  & 3.333***&6.333***& 7.333*** & 7.334***& 6.353*** & 6.333*** \\
\rowcolor{blue!10}  & (0.111) &(0.112)& (0.112) & (0.113) & (0.173)& (0.178) \\\addlinespace
\midrule
\textbf{Health Variables}  
      &        &     &          & {X}       & {X}    & {X}    \\ 

 \midrule

\textbf{Other Effects} \\
Time 
    &           & {X}       &     &    &  {X}            \\
Location
    &           &           &      {X}    & &  & {X}            \\
\midrule
Number  & {11,210} & {11,210} & {11,210} & {10,504} &{10,504} &{10,504}  \\
 K-Number  & {63.11} & {61.33}  & {58.33}  & {56.01}  & {50.93} & {53.77}  \\ 
 \hline
    \bottomrule
  \end{tabularx}
\end{table}
\end{frame}



\end{document} 

Answer 1

I did a quick search and it seems that there is a big conundrum concerning colortbl, the trick you employ to make the table fill the full page, and using the features of the S column of siunitx, in particular when paired with beamer. One probably can pair the solutions by our moderators from this post with a fragile frame (I did not try, without fragile it obviously won't work). But I came across several statements by rather seasoned users from this site who say that colortbl is never perfect, one may use tikz instead, which you seem to already loading. So the solution is to use tikzpagenodes and the tikzmark library to locally switch on a background of these colors. For this it is necessary to drop the table option from \documentclass[table,slidestop,compress,mathserif, 10pt]{beamer}, and to reset the background in the subsequent frame.

\documentclass[slidestop,compress,mathserif, 10pt]{beamer}
\usepackage{array}
\usetheme{Frankfurt}
\usepackage{booktabs}
\usepackage{longtable}
\usepackage{siunitx}
\usepackage{dsfont}
\newcommand\mcc[1]{\multicolumn{1}{c}{#1}}

\usepackage[orientation=landscape,size=custom,width=16,height=9,scale=0.5,debug]{beamerposter} 

% Custom numbering for the footline
\setbeamertemplate{footline}{%
  \raisebox{5pt}{%
    \makebox[\paperwidth]{%
      \hfill\makebox[7pt]{%
        \tiny\insertframenumber
      }
    }
  }
}
\definecolor{dgreen}{rgb}{0.,0.6,0.}
\definecolor{dblue}{rgb}{0.,0.,0.6}
\definecolor{dred}{rgb}{0.6,0.,0.}

\usepackage{tikzpagenodes}
\usetikzlibrary{tikzmark}
\usepackage{eso-pic}



\begin{document}

\begin{frame}[t]
\frametitle{Test}

\end{frame}


\setbeamertemplate{background}{\begin{tikzpicture}[overlay,remember picture]
 \fill[blue!20] (current page text area.west|-row1.south)
 rectangle (current page text area.east|-row1.north);
 \fill[blue!10] (current page text area.west|-row2.south)
 rectangle (current page text area.east|-row2.north);
\end{tikzpicture}}

\setcounter{subsection}{9}
\begin{frame}{Regression}

\begingroup
\footnotesize
\sisetup{table-format=1.4,
         table-space-text-pre=(,
         table-space-text-post=***,
         table-align-text-post=false,
         input-symbols=(),
         table-alignment=right
         }
\setlength\LTleft{0pt}
\setlength\LTright{0pt}
\setlength\tabcolsep{0pt}
 \vspace*{-0.53cm}
    \begin{longtable}{@{\extracolsep{\fill}} l
                                           *{6}{S}}
     \toprule  
\multicolumn{1}{c}{}
    & \mcc{(I)} & \mcc{(II)} & \mcc{(III)} & \mcc{(IV)} & \mcc{(V)} & \mcc{(VI)}  \\
    \midrule
\endhead
    \bottomrule
\endlastfoot 
\tikzmarknode{row1}{\strut} $\mathds{1}$(Hospital$_{i})\times\mathds{1}$(Doctor$_{t}$)  & 3.333***&6.333***& 7.333*** & 7.334***& 6.353*** & 6.333*** \\
\tikzmarknode{row2}{\strut} & (0.111) &(0.112)& (0.112) & (0.113) & (0.173)& (0.178) \\\addlinespace


 \midrule
\textbf{Health Variables}  
      &        &     &          & {X}       & {X}    & {X}    \\ 

 \midrule

\textbf{Other Effects} \\
Time 
    &           & {X}       &     &    &  {X}            \\
Location
    &           &           &      {X}    & &  & {X}            \\
\midrule
Number  & {11,210} & {11,210} & {11,210} & {10,504} &{10,504} &{10,504}  \\
 K-Number  & {63.11} & {61.33}  & {58.33}  & {56.01}  & {50.93} & {53.77}  \\ 
 \hline
\end{longtable}
\endgroup

\end{frame}


\setbeamertemplate{background}{}

\begin{frame}[t]
\frametitle{Another test}

\end{frame}    
\end{document}

I also replaced mathbbm by mathds because its glyphs are very similar but not pixelated, and so on. However, I did not completely tune this answer.