The phrase "occurrence rate" refers to how often something happens or takes place within a certain period of time. It helps us understand the frequency or likelihood of an event happening. Full definition
We then compare the number of observed planet candidates to the number of stars around which such planets could have been detected in order to estimate the planet occurrence rate around cool stars. (arxiv.org)
India unfortunately is bearing a lot because of high occurrence rates of communicable diseases, along with a rising burden of chronic diseases. (policybazaar.com)
Our data also rule out a constant planet occurrence rate for [Fe / H] < 0, indicating that giant planets continue to become rarer at sub-Solar metallicities. (arxiv.org)