Fraction of zeros

Question

What is the definition of "fraction of zeros"?

Here is an example of its usage.

Sorry for such a simple question, but I have searched quite a bit now and have not been able to find a definition for this.

Answer 1

Fraction of zeros is the percentage amount of statistical data which is zero. It is relevant in statistical models where a significant amount of objects has zero value. See zero inflated models for some more information or this blog for discussing their relevance.

You may also search for the string zero in your referred book. You will find there some text entries about inflated models.