# Advertising reports: denominators, zero conversions and small samples

CTR=clicks/impressions; CVR=conversions/clicks; CPA=spend/conversions; ROAS=conversion_value/spend. A zero denominator means not calculated. Fewer than 10 conversions is a small sample, not a scale/stop decision. All amounts are CNY major units; verify actual API units and attribution separately.

Amounts are synthetic CNY values. No real Ads account or attribution report was read; no ad, bid or budget was changed.