stacker.news/prisma/migrations/20220630170204_upvote_trust/migration.sql

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2022-06-27 20:49:52 +00:00
-- AlterTable
ALTER TABLE "users" ADD COLUMN "upvoteTrust" DOUBLE PRECISION NOT NULL DEFAULT 0;
CREATE OR REPLACE FUNCTION confidence(successes FLOAT, trials FLOAT, z FLOAT)
RETURNS FLOAT
LANGUAGE plpgsql
AS $$
DECLARE
p FLOAT;
lhand FLOAT;
rhand FLOAT;
under FLOAT;
BEGIN
IF trials = 0 THEN
RETURN 0;
END IF;
p := successes / trials;
lhand := p + 1 / (2 * trials) * z * z;
rhand := z * sqrt(p * (1 - p) / trials + z * z / (4 * trials * trials));
under := 1 + 1 / trials * z * z;
RETURN (lhand - rhand) / under;
END;
$$;