Snowball Sampling is when you find people to help you learn something by starting with a few friends and asking them to bring more friends.
Imagine you want to know what all the kids in your school like for lunch. You start by asking your best friend, Sam. Sam says yes, and then asks their best friend, Mia. Mia says yes, and asks her best friend, Leo. Soon, everyone is helping you find out what people eat for lunch, just like a snowball rolling down a hill, getting bigger and bigger as it goes.
How It Grows
At first, you only know a little bit about lunch choices, just your friends’ favorites. But when they ask their friends, who ask their friends, the list of people you’re learning from gets longer, like a growing snowball.
This is super useful if you don’t know many people at first, it’s like having a chain letter that helps you find more and more helpers.
Snowball Sampling is like starting with one or two friends and then letting them help you grow your group, one friend at a time!
Examples
- A researcher asks one person about a study, and that person tells two friends, who each tell two more people, like a snowball growing bigger.
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See also
- How Does The Problem of Multiple Comparisons | NEJM Evidence Work?
- Who is Small Sample Sizes?
- What are bootstrap-based tests?
- How Does Bayesian vs. Frequentist Statistics ... MADE EASY!!! Work?
- How Does Causal Effects via the Do-operator | Overview & Example Work?