Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2012 Feb 16;7(2):e31648. doi: 10.1371/journal.pone.0031648

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Chiu et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

The percentage weight of a formula or herb in a prescription is calculated. The weights are averaged over individual cancers, and then over the 30 cancer types. Formulas and herbs are ranked according to the averaged weights. (A) Weights averaged over the 30 cancers are plotted against their ranks. Note of the log scale of the axes. Lines are linear regressions to their top 50 formulas and/or herbs. The slopes of the lines give the Zipf exponents. (B) Weights over individual cancers are plotted against their ranks. Lines are linear regression fits to their top 20 formulas and herbs.