What is analogous estimation?

Analogous estimation (analogous estimate) is a method of estimating the time, cost, or resources of a project based on data from previous, similar projects. Instead of a detailed analysis of the current task, experience and metrics from already completed projects with similar characteristics are used. This method allows for a quick approximate estimate, especially in the early stages of planning when detailed information is scarce.

Example: if in a past project, developing a similar module took 3 weeks, then for a new module with similar requirements, a similar duration can be assumed.