Comments on the Paper by Alexis B. Long Entitled "Review of Persistence Effects of Silver Iodide Cloud Seeding"

E. K. Bigg


Statistical analyses of cloud seeding using fixed target and control areas usually contain several hidden assumptions, thought to be so obviously true that they are never stated. They are: 1. The effects of seeding are confined to the day of seeding. 2. There are no cumulative effects of seeding. 3. Unseeded control areas that are crosswind or upwind from the target on the day of seeding are never affected by seeding in the target area.

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