Genes or proteins that have common activity/function but not common origin. They are therefore not homologous. The implication is that analogous proteins followed evolutionary pathways from different origins to converge upon the same activity. Thus, analogous genes or proteins are considered a product of convergent evolution.

Analogs are sets of data containing the most important independent variables which relate to sales performance. An analog dataset can be organized at the trade area level or at the map section level. In sales forecasting for new sites, the analyst culls through the analogs to find those which are most similar in the key characteristics to the trade area or map section under examination. Analyst judgments are integral to good sales estimates in the analog process.

Drugs whose chemical structures have been slightly modified from a parent compound. There are many analogs to morphine or to LSD. See Designer drug.

The two things (or classes of things) that are said to be similar in an argument from analogy.