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Chapter 7

# IHS 4504 Chapter Notes - Chapter 7: Multistage Sampling, Simple Random Sample, Cluster Sampling

Department
Interdis. Health Sciences
Course Code
IHS 4504
Professor
Jayanta Gupta
Chapter
7

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Cluster (or Area) Sampling
- Cluster/area sampling: a type of probability sampling in which the samplingunit is
composed of groups (or clusters or areas), not individuals
- A more advanced use of the cluster sampling method is multistage center sampling
method.
o Multistage cluster (or area) sampling: a combination of cluster sampling and
simple random sampling techniques “in which a series of random selections is
made from units of progressively smaller size.”
Matrix sampling
- Matrix sampling: a type of probability sampling in which the participants needs to
respond to a large number of items; instead of responding to all items, several randomly
selected participants’ responses to different items are combined to form the response
of one.
Nonprobability Sampling
- There are times when a probability sample cannot be obtained or is not needed.
- When using such methods, it must be remembered that there is an increased chance of
sampling bias and there is no theoretical basis for estimating study population
characteristics.
Convenience sampling
- Convenience sampling: a type of nonprobability sampling in which participants are
selected based on certain inclusion criteria and their accessibility and proximity to the
researcher.
o It is the weakest of all sampling methods yet perhaps the one that is most
frequently used.
Volunteer Sampling
- Volunteer sampling: a type of nonprobability sampling in which participants are
motivated enough to self-select for the study.
o Because of the difficulty of getting some people to volunteer in a study, it is not
unusual to see researchers offer an incentive to potential participants to get
them to volunteer.
Grab Sampling
- Grab sampling: also called chuck sampling; a type of nonprobability sampling in which
the participants include whomever researchers can access through direct contact.
Homogenous Sampling
- Homogenous sampling: a type of nonprobability sampling in which a very specific group
of individuals are selected because they possess a unique trait or factor.
Judgmental sampling
- Judgmental/ purposive sampling: a type of nonprobability sampling in which researchers
selected participants that they judge to be “typical” of individuals possessing aa given
trait.
Snowball Sampling
- Snowball/ chain sampling: a type of nonprobability multistage sampling in which
participants with certain characteristics are selected and then asked if they know others
with the same characteristics that could be included in the sample.