Type of sampling [14] | Used or not used in this sampling framework | Potential ways in which we could use it in future |
---|---|---|
Extreme or deviant case sampling | We did not use this type of sampling in this review | This approach could be very useful when setting out sampling for a review when the review question addresses why something did or did not work or when re sampling after you have a set of findings i.e. when updating a review |
Maximum variation sampling | Used to help create our sampling frame | We used this to create the first step of our sampling frame. It could also be useful to apply when sampling for other variables such as intervention, population or socioeconomic status. |
Snowball or chain sampling | We did not use this type of sampling in this review | We believe that this approach could be used if there were key articles in the field. However, it should still be supported by a systematic search and sampling. |
Theoretical or operational construct sampling | We did not use this type of sampling in this review | Useful if performing a systematic review of different theoretical or operational constructs. For example, theories of behaviour change as applied to different smoking prevention programs. |
Criterion sampling | Used to help create our sampling frame | We decided on the criterion that were central to our research objective and created a sampling framework around them. |
Stratified purposeful sampling | We did not use this type of sampling in this review | We have since used this approach in another review where we divided the studies by population and then applied the same sampling frame to each population. |
Purposeful random sampling | We did not use this type of sampling in this review | We do not regard random sampling as useful or appropriate when trying to explore a specific phenomenon of interest |
Combination or mixed purposeful sampling | Used to help create our sampling frame | We combined different sampling methods to create our three step sampling frame that worked for our specific research objective |