1248 |
\centering |
\centering |
1249 |
%\fbox{\vbox{\vskip 3in}} |
%\fbox{\vbox{\vskip 3in}} |
1250 |
\ifpics |
\ifpics |
1251 |
\includegraphics[width=6cm]{zipf} |
\includegraphics[width=6cm]{zipfarea.1} |
1252 |
\fi |
\fi |
1253 |
\caption{ |
\caption{ |
1254 |
\label{fig-zipf} |
\label{fig-zipf} |
1255 |
Idealized representation of typical document usage pattern according |
Zipf's law concretized: why remembering 15 textures helps. |
1256 |
to Zipf's law: |
In real life, accesses to documents often follow Zipf's law, meaning that |
1257 |
the solid curve represents the access count as a function of rank |
some documents get accessed far more often than most. |
1258 |
for 100 documents (only the first 15 shown) |
Each square represents a document, and the area of each square is scaled |
1259 |
and the dotted curve represents the cumulative proportion of accesses. |
to its rate of accesses. |
1260 |
|
The diagram shows 2000 documents weighted with Zipf's law with exponent 1.1. |
1261 |
The 15 most important documents account XXX\% of the accesses. |
The 15 most important documents account XXX\% of the accesses. |
1262 |
} |
} |
1263 |
\end{figure} |
\end{figure} |