Quota sampling

Quota sampling method is a non-probability sampling and it can be defined as “a sampling method of gathering representative data from a group”[1]. Application of quota sampling ensures that sample group represents certain characteristics of the population chosen by the researcher.[1]

Quota sampling can be divided into two groups: controlled and uncontrolled. Controlled sampling involves introduction of certain restrictions in order to limit researcher’s choice of samples.

Uncontrolled sampling, on the other hand, resembles convenience sampling method in a way that researcher is free to choose sample group members according to his/her will.

The main difference between quota and stratified sampling can be explained in a way that in quota sampling “researchers use non-random sampling methods to gather data from one stratum until the required quota fixed by the researcher is fulfilled”[2]. Accordingly, the quota is based on the proportion of subclasses in the population.

Application of Quota Sampling: an Example

Your research objective is to evaluate the impact of cross-cultural differences on employee motivation in Virgin Media in the UK. You need to assess the effectiveness of employee motivational tools taking into account gender differences among the workforce.

Quota sampling can be applied in the following manner:

1. Dividing the population into specific groups.

Virgin Media employees in the UK as the sampling frame need to be divided into the following five groups according to their cultural background:

1. European
2. Asian (India)
3. Asian (China)
4. Black (African)
5. Other

1. Calculating a quota for each group.

You supervisor confirms that in order to achieve research objectives, 30 representatives from each group and the total sample size of 150 respondents would be appropriate.

1. Determine specific condition(s) to be met and quota in each group

Both genders, males and females need to be represented equally in your sample group. This is a specific condition that has to be satisfied. Accordingly, you recruit 15 males and 15 females from each group.

Application of quota sampling ensures that sample group represents certain characteristics of the population chosen by the researcher. In example above, an equal representation of both genders, males and has been chosen as an important characteristic of sampling.

1. Quota sampling emerges as an attractive choice when you are pressed for time, since primary data collection can be done in shorter time with this method compared to many alternatives.
2. The application of quota sampling can save costs and time.
3. Quota sampling is not dependent on the presence of the sampling frames. In occasions where suitable sampling frame is absent, quota sampling may be the only appropriate choice available.