Latent semantic indexing (LSI) is the science of natural language processing. It analyzes relationships between words and is designed to distinguish naturally written text from keyword-stuffed documents. Latent semantic indexing considers natural and synonymous relationship between words.
For example, if you're examining an article about an airplane, the LSI system will look for synonyms: plane, aircraft, aero plane. and other related words, which are NOT synonymous, but are often mentioned when discussing airplanes: turbulence, ailerons, fuel, sky clouds,, roll, pitch, etc.
The point of LSI is to detect natural writing and distinguish it from robotic copy written to manipulate search results. Google purchased the company Applied Semantics, which developed advanced LSI technology. Their know-how was incorporated into AdSense, and possibly into search algorithms.
So, write naturally and forget about measurements such as keyword density, and mix related and synonymous phrases into your anchor text.
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