\begin{figure}[ht!]
\centering
{\scriptsize  
\begin{tabular}{c|l|cc|cc|cc}
\multicolumn{2}{c}\textbf{} 	&	\multicolumn{2}{c}{\textbf{Cocomo81}}			&	\multicolumn{2}{c}{\textbf{Nasa93}}			&	\multicolumn{2}{c}{\textbf{Desharnais}}			\\\hline
	&	\textbf{\textit{k}} 	&	MdMRE	&	Pred(25)\%	&	MdMRE	&	Pred(25)\%	&	MdMRE	&	Pred(25)\%	\\\hline
\multirow{11}{1mm}{\begin{sideways}\parbox{10mm}{IRWM}\end{sideways}}	&	3	&	0.42	&	8.97	&	0.40	&	36.23	&	0.39	&	35.93	\\
	&	5	&	0.44	&	8.81	&	0.42	&	38.2	&	0.37	&	37.59	\\
	&	7	&	0.48	&	8.57	&	0.43	&	41.82	&	0.37	&	38.52	\\
	&	9	&	0.51	&	9.05	&	0.43	&	45.49	&	0.36	&	35.43	\\
	&	d	&	0.86	&	12.62	&	0.80	&	179.44	&	0.37	&	35.43	\\
	&	3+N	&	0.59	&	8.02	&	0.57	&	55.87	&	0.46	&	24.01	\\
	&	5+N	&	0.64	&	8.33	&	0.61	&	59.91	&	0.49	&	19.07	\\
	&	7+N	&	0.66	&	7.3	&	0.63	&	61.75	&	0.51	&	16.79	\\
	&	9+N	&	0.68	&	7.62	&	0.64	&	63.02	&	0.51	&	16.54	\\
	&	d+N	&	0.79	&	9.68	&	0.74	&	95.44	&	0.51	&	16.54	\\
\end{tabular}}
\caption{MdMRE and Pred(25) results of Cocomo81, Nasa93 and Desharnais for IRWM weighted N-ABE. \textbf{\textit{k}} stands for the number of analogies used for estimation and $+N$ sign means that non-uniform weighting is used for estimation. Similar to N-ABE methods through standard kernels, expert proposed kernel cannot perform an improvement to ABE0.
}\label{fig:irwm-mdmre-mmre}
\end{figure}