According to the PMBOK® Guide, specifically within the Estimate Costs and Estimate Activity Durations processes, Analogous Estimating is a technique used to estimate the duration or cost of an activity or a project using historical data from a similar activity or project.

Basis of Estimation: It uses values such as scope, cost, budget, and duration or measures of scale (such as size, weight, and complexity) from a previous, similar project as the basis for estimating the same parameter or measure for a current project.

When to Use: It is frequently used when there is a limited amount of detailed information about the project (e.g., in the early phases of a project).

Characteristics:

Cost and Time: It is generally less costly and time-consuming than other techniques.

Accuracy: It is generally less accurate than parametric or bottom-up estimating.

Reliability: It is most reliable when the previous projects are similar in fact and not just in appearance, and the project team members preparing the estimates have the needed expertise.

Top-Down Nature: Analogous estimating is a form of expert judgment and is often referred to as a top-down approach because it looks at the project as a whole rather than its individual components.

Comparison with other options:

B. Parametric: This technique uses a statistical relationship between historical data and other variables (e.g., square footage in construction) to calculate an estimate. It is more data-driven than analogous estimating.

C. Bottom-up: This involves estimating the cost or duration of individual work packages or activities and then summarizing (rolling up) these estimates to higher levels. It is the most accurate but also the most time-consuming.

D. Top-down: While analogous estimating is a type of top-down estimation, " Top-down " is a general category. In the context of specific PMI tools and techniques for estimating, Analogous is the formal term used to describe the use of previous similar projects as the primary basis.