Evidence is contrast. Every “yes” needs its “no,” every success its failure, every win its baseline of total attempts. Rates require denominators, and patterns require counter-patterns. Drop the “other half” and the tallest bars will always seduce you into over-reading. Keeping both sides also surfaces asymmetries that matter for action: maybe the success rate barely shifts, but the cost of a false positive doubles… very different decision. Preserve the full 2×2 or multi-cell structure even when you only plan to discuss one corner; it prevents you from mistaking volume for likelihood and from confusing composition effects with real change. And when you visualize, show both tails: counts and totals, hits and misses, present and absent. The point isn’t to make charts busier…it’s to make claims truer. Half the data is half the truth.
