What about keyword density?

What about keyword density?

The keyword density metric is used to determine how often a keyword occurs in the content you publish and is usually expressed as a percentage.
Keyword density criteria varies depending on the search being performed.
Determining the ideal keyword density for an article requires researching the competition that ranks higher than you.
Based on your competitors' keyword-rich content, try to reach the same level of keyword density without compromising the quality of your content.