17 - sampling in qualitative data

most comonly used type of sample in qual

purposive

ethongraphic reseach

qualitative

2 levels of sampling

1. case / context

2. participants

purposive sampling

non pron

on basis of info they provide (intentional)

each unique

extreme / deviant case sampling

unusual that demonstrate exceptional qualities

Typical case sampling

typical in case of features

critical case sampling

features that are central to phenomenon

maximum variation

describe common features / themes that exist across a wide variety of contexts

criterion sampling sampling

cases / units that meet particular criterion

theoretical sampling

selection of cases / units is controlled by theory

Snowball sampling

sampling a small group + relying on these to bring more

opportunistic sample

first come first serve

stratified purposive sampling

sampling particular subgroup of interest

maximum variation sampling

Generic purposive sampling

deliberate selection + specific criteria

Snowball sampling

select group

group selects more ppl

key considerations in qual research - sample size

around 30

• saturation (theoretical saturation / data saturation)

• minimum

• style or theoretical underpinnings of research

• heterogenity of the pop

• research question

analytic generalisation

case to case transfer

sampling context

need to sample dif contexts within which interviewing / obs take place

consider:

• time - ppl / event observed at the dif time / day

• context - observed in variety of location

more than one sampling method

both purposive + representative