AIO表示キーワード分析

AIO月間流入予想 = 月間検索ボリューム × AIO CTR係数

// src/lib/ctr-coefficients.ts
export const AIO_CTR_COEFFICIENTS: Record<number, number> = {
  1: 0.040,  // 4.0%
  2: 0.022,  // 2.2%
  3: 0.012,  // 1.2%
  4: 0.006,  // 0.6%
  5: 0.003,  // 0.3%
};
export const AIO_CTR_DEFAULT = 0.001;  // 6位以降: 0.1%

export function calculateAIOTraffic(
  searchVolume: number,
  aioPosition: number
): number {
  if (!searchVolume || searchVolume <= 0) return 0;
  if (!aioPosition || aioPosition <= 0) return 0;

  const ctr = AIO_CTR_COEFFICIENTS[aioPosition] ?? AIO_CTR_DEFAULT;
  return Math.round(searchVolume * ctr);
}

// src/lib/ctr-coefficients.ts
export const SERP_CTR_WITH_AIO_FACTOR = 0.40;

export function calculateSERPTraffic(
  searchVolume: number,
  serpPosition: number,
  hasAIO: boolean = true
): number {
  if (!searchVolume || searchVolume <= 0) return 0;
  if (!serpPosition || serpPosition <= 0) return 0;

  const baseCtr = SERP_CTR_COEFFICIENTS[serpPosition] ?? SERP_CTR_DEFAULT;
  const adjustedCtr = hasAIO ? baseCtr * SERP_CTR_WITH_AIO_FACTOR : baseCtr;

  return Math.round(searchVolume * adjustedCtr);
}