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balanced panel:unbalanced panel:
p e r s o n y e a r i n c o m e a g e s e x 1 2003 1500 27 1 1 2004 1700 28 1 1 2005 2000 29 1 2 2003 2100 41 2 2 2004 2100 42 2 2 2005 2200 43 2 {\displaystyle {\begin{matrix}\mathrm {person} &\mathrm {year} &\mathrm {income} &\mathrm {age} &\mathrm {sex} \\1&2003&1500&27&1\\1&2004&1700&28&1\\1&2005&2000&29&1\\2&2003&2100&41&2\\2&2004&2100&42&2\\2&2005&2200&43&2\end{matrix}}} p e r s o n y e a r i n c o m e a g e s e x 1 2003 1500 27 1 1 2004 1700 28 1 2 2003 2100 41 2 2 2004 2100 42 2 2 2005 2200 43 2 3 2004 3000 35 1 {\displaystyle {\begin{matrix}\mathrm {person} &\mathrm {year} &\mathrm {income} &\mathrm {age} &\mathrm {sex} \\1&2003&1500&27&1\\1&2004&1700&28&1\\2&2003&2100&41&2\\2&2004&2100&42&2\\2&2005&2200&43&2\\3&2004&3000&35&1\end{matrix}}}

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