Sampling (5) Flashcards
External validity : generalizing
process of making an inference that results observed in a sample would hold in the population of interest.
Non-probability sampling
does not involve random selection
difficult to say if population is good presented
not so confident in generalizing
Accidental or convenience sampling
person on person street interview
college students
Purposive sampling
purpose related : looking for something more specific
Model instance sampling
sampling for the most typical case
Expert sampling
people with known or demonstrable experience and expertise in some area
Quota sampling
select people nonrandomly according to some fixed quota until you achieve a specific number of samplied units for each subgroup of a population
Heterogeneity sampling
include all opinions or views ( diversity )
Snowball sampling
begin by identifying people who meet criteria for inclusion in your study - ask them to recommend others who meet the criteria
probability sampling
lowers the possibility of biased - external validity
stratified random sampling
involves dividing you population into homogeneous subgroups and than taking a simple random sample in each subgroup
systematic random sampling
determine randomly where you want to start selecting in the sampling frame and then follow a rule to select every xth element in the sampling frame list
cluster random sampling
dividing population into groups called clusters, randomly selecting clusters, and then sampling each element in the selected clusters
multistage sampling
connecting different sampling collecting styles
improving external validity
use random selection
dropout rates low
providing data about the degree of similarity between various groups
replicate your study in various ways
