The marketing metric that can be used to evaluate a company's marketing plan is : Portfolio analysis.
Portfolio analysis is an examination of the components included in a mix of products with the purpose of making decisions that are expected to improve overall return.
Steps to portfolio analysis includes:
Therefore, portfolio analysis is a marketing metric, used to evaluate the performance of a company's implementation of its marketing plan.
Learn more about portfolio analysis here : https://brainly.com/question/2758250