\documentclass{article}
\usepackage[margin=20mm]{geometry}
\usepackage{gradbars}
\usegradbarslibrary{reports}
\setlength{\parindent}{0pt}
\begin{document}
\section*{Correlation matrix}
\begin{center}
\begin{gradtable}[align=c,header align=c,style=correlation]
\gradcolumn{name}{Variable}
\gradcorrelationcolumn{a}{A}
\gradcorrelationcolumn{b}{B}
\gradcorrelationcolumn{c}{C}
\gradrow{A,1,.72,-.38}
\gradrow{B,.72,1,NA}
\gradrow{C,-.38,NA,1}
\end{gradtable}
\end{center}\par
\section*{Ablation: reference/current}
\begin{center}
\begin{gradtable}[align=c,header align=c,style=ablation]
\gradcolumn{name}{Variant}
\gradablationcolumn{score}{Score change}
\gradrow{Without augmentation,80/76}
\gradrow{With extra data,80/84}
\gradrow{Pending,NA/NA}
\end{gradtable}
\end{center}\par
\section*{Metrics with explicit directions and units}
\begin{center}
\begin{gradtable}[align=c,header align=c,style=metrics,width=\linewidth]
\gradcolumn{name}{Model}
\gradmetriccolumn{accuracy}{Accuracy}
\gradmetriccolumn[options={style=report-metric,better=lower,unit={ ms},precision=1}]{latency}{Latency}
\gradrow{Alpha,92,35}
\gradrow{Beta,95,48}
\gradrow{Gamma,90,28}
\end{gradtable}
\end{center}
\end{document}