باید همه اعداد را در محیط ریاضی داخل یک جفت $...$ قرار دهید تا به درستی چاپ شوند. من قسمت جدول را اصلاح کردم که میتوانید کپی کنید:
\begin{tabular}{c c c | c c| c c | c c}
\hline\hline
\multicolumn{3}{c|}{مقادیر واقعی} & \multicolumn{2}{| c|}{برآورد $k$} & \multicolumn{2}{|c|}{برآورد $a$} & \multicolumn{2}{| c}{برآورد $s$} \\ \cline{1-3}\cline{4-5}\cline{6-7}\cline{8-9}
{$k$} & {$a$} & {$s$} & میانگین & RMSE & میانگین & RMSE & میانگین & RMSE \\
& & & (فاصله اطمینان) & & (فاصله اطمینان) & & (فاصله اطمینان) & \\ \hline\hline
$0.25$ & $0.25$ & $0.25$ & $0.2668$ & $\mathbf{0.0192}$ & $0.2499$ & $\mathbf{0.0032}$ & $0.2556$ & $\mathbf{0.0243}$ \\
& & & ($0.11,0.41$) & & ($0.15,0.34$) & & ($0.06,0.44$) & \\
$0.25$ & $0.25$ & $0.5$ & $0.2687$ & $\mathbf{0.0213}$ & $0.2529$ & $\mathbf{0.0044}$ & $0.5390$ & $\mathbf{0.0670}$ \\
& & & ($0.19,0.34$) & & ($0.15,0.34$) & & ($0.36,0.71$) & \\
$0.25$ & $0.5$ & $0.25$ & $0.2933$ & $\mathbf{0.0516}$ & $0.4842$ & $\mathbf{0.0200}$ & $0.3036$ & $\mathbf{0.0643}$ \\
& & & ($0.23,0.35$) & & ($0.23,0.72$) & & ($0.22,0.37$) & \\
$0.5$ & $0.25$ & $0.25$ & $0.5251$ & $\mathbf{0.0387}$ & $0.2553$ & $\mathbf{0.0030}$ & $0.2684$ & $\mathbf{0.0227}$ \\
& & & ($0.32,0.72$) & & ($0.15,0.35$) & & ($0.13,0.40$) & \\
$1$ & $0.5$ & $0.25$ & $1.0530$ & $\mathbf{0.0648}$ & $0.4820$ & $\mathbf{0.0195}$ & $0.4673$ & $0.2130$ \\
& & & ($0.80,1.30$) & & ($0.32,0.64$) & & ($0.35,0.45$) & \\
$0.75$ & $1$ & $0.25$ & $0.7755$ & $\mathbf{0.0328}$ & $1.1301$ & $\mathbf{0.0810}$ & $0.8201$ & $0.6538$ \\
& & & ($0.21,1.33$) & & ($0.76,1.49$) & & ($0.61,1.02$) & \\
$0.25$ & $0.75$ & $1$ & $0.6024$ & $0.4075$ & $0.7297$ & $\mathbf{0.0202}$ & $1.1600$ & $0.1600$ \\
& & & ($0.49,0.70$) & & ($0.41,1.02$) & & ($0.70,1.61$) & \\
$1.5$ & $0.25$ & $0.25$ & $1.4699$ & $\mathbf{0.0300}$ & $0.2635$ & $\mathbf{0.0135}$ & $0.3923$ & $0.1423$ \\
& & & ($0.94,1.97$) & & ($0.03,0.48$) & & ($0.19,0.58$) & \\
$0.25$ & $1.5$ & $0.5$ & $0.4650$ & $0.2150$ & $1.7133$ & $0.2133$ & $0.5666$ & $\mathbf{0.0966}$ \\
& & & ($0.34,0.58$) & & ($1.09,2.33$) & & ($0.34,0.78$) & \\
$0.5$ & $0.25$ & $1.25$ & $0.5191$ & $\mathbf{0.0191}$ & $0.2467$ & $\mathbf{0.0032}$ & $1.3674$ & $0.1174$ \\
& & & ($0.33,0.70$) & & ($0.14,0.34$) & & ($0.71,2.01$) & \\
$0.5$ & $0.25$ & $2.25$ & $0.5222$ & $\mathbf{0.0222}$ & $0.2453$ & $\mathbf{0.0046}$ & $2.4959$ & $0.2459$ \\
& & & ($0.31,0.73$) & & ($0.15,0.33$) & & ($1.11,3.95$) & \\
$1$ & $0.25$ & $2$ & $1.0428$ & $\mathbf{0.0428}$ & $0.2447$ & $\mathbf{0.0052}$ & $2.5338$ & $0.5338$ \\
& & & ($0.59,1.48$) & & ($0.10,0.38$) & & ($0.97,4.09$) & \\
$0.5$ & $2$ & $0.25$ & $0.6672$ & $0.1672$ & $2.2825$ & $0.2825$ & $0.3191$ & $\mathbf{0.0691}$ \\
& & & ($0.54,0.78$) & & ($1.69,2.87$) & & ($0.26,0.36$) & \\ \hline
\end{tabular}
راهحل دیگری در اینجا آمده است.