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${\displaystyle n=\sum _{i=1}^k{f}_i}$

${\displaystyle F_i=\sum _{j=1}^i{f}_i}$

${\displaystyle k=\lceil \sqrt{n}\rceil }$

${\displaystyle k=\lceil {\log }_{2}n\rceil +1}$

${\displaystyle k=\lceil 2\sqrt[3]{n}\rceil }$

${\displaystyle k=1+{\log }_{2}n+{\log }_2(1+\frac{|g_1|}{{\sigma }_{g_1}})}$

${\displaystyle {\sigma }_{g_1}=\sqrt{\frac{6(n-2)}{(n+1)(n+3)}}}$

${\displaystyle h=\frac{3.5\hat{\sigma }}{\sqrt[3]{n}}}$

${\displaystyle h=\frac{2IQR(x)}{\sqrt[3]{n}}}$

${\displaystyle \overline{m}=\frac{1}{k}\sum _{i=1}^k{m}_i,v=\frac{1}{k}\sum _{i=1}^k(m_i-\overline{m}{)}^2}$

${\displaystyle h=\underset{h}{argmin}\frac{2\overline{m}-v}{h^2}}$