N-Gram Analysis: The PPC Negative Keyword Architecture Most Sellers Have Never Built

One word  "repair"  was hiding across 23 non-converting search terms in a single account. Combined spend: $847. Combined sales: zero. One phrase-match negative fixed all 23 at once. Most sellers would never have found it.Why do standard search term audits miss the majority of structural wasted spend in Amazon PPC campaigns?Because they audit by row, not by pattern. Amazon's broad and phrase match systems generate traffic across hundreds of keyword variations simultaneously — each spending $8–$15 individually, none triggering a negation threshold on its own. N-gram analysis breaks your search term report into one- and two-word fragments and aggregates spend and orders by fragment across your entire account. The patterns that are invisible term by term become obvious immediately. Industry data puts structural waste at 20–40% of total ad spend in unaudited accounts. N-gram analysis finds it in a single pass.In this episode, Peter walks through exactly how n-gram analysis works, how to run it on your own search term report, and why phrase-match negatives built from fragment patterns block structural waste more durably than any reactive exact-match approach.What you'll learn:Why row-by-row search term auditing is damage control, not optimization — and the threshold problem that guarantees waste stays ahead of your correctionsHow n-gram analysis compresses thousands of search terms into 30,000–50,000 distinct fragments, making structural non-converting patterns immediately visibleThe exact process for pulling your search term report, extracting fragments, and identifying phrase-match negative candidates in under two hoursWhy phrase-match negatives built from n-gram fragments block future irrelevant variations automatically — not just the terms you've already seenHow to validate candidate fragments against your active keyword list before negating to prevent costly over-blockingSubscribe to the Amazon Rufus show for practitioner-level analysis of Amazon advertising, AI-driven search, and the backend systems that determine which products get found and which don't.This episode is brought to you by Atomic AMZ. We help brands get discovered, rank and scale on Amazon — for sellers who've outgrown generic agencies.Our free account audit includes a search term architecture review alongside Rufus visibility analysis and listing structure assessment — so you can see exactly where your ad spend is leaking and where your AI discoverability is falling short. Claim yours at atomicamz.com.#AmazonSellers #AmazonFBA #AmazonPPC #AmazonAdvertising #NegativeKeywords #AmazonRufus #EcommerceStrategy #AmazonSEO #AmazonMarketing #PPCOptimization