If you were studying a rare disease, such as Progeria, and asked a patient with that condition to put you in touch with other patients who had the disease, this would be an example of which type of sampling?

Question

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Snowball sampling uses referrals from any individual who is identified with a particular condition or disease. Patients with unusual conditions may be in contact with other patients who also have the same condition and are willing to ask them to participate.

If You Were Studying a Rare Disease, Such as Progeria