The leading-indicator join: E&S premium (with YoY growth) aligned period-by-period against admitted-market SERFF rate-filing activity (filing_count, avg_rate_change_pct, share_increasing, max_increase) on the shared coverage category. `lag` shifts the rate series back N periods to test the relationship. TX only; category join is annual, line=all also monthly/quarterly. Two aligned data families, not a prediction. $0.50/query. Free: /v1/rates/sample. Docs: https://api.querylines.com/openapi.json

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