Sample Size in Qualitative Interview Studies: Guided by Information Power
Sample Size in Qualitative Interview Studies: Guided by Information Power
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DOI：
10.1177/1049732315617444
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发表时间：
2016-11-01
影响因子：
3.2
通讯作者：
Guassora, Ann Dorrit
中科院分区：
文献类型：
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作者：
Malterud, Kirsti;Siersma, Volkert Dirk;Guassora, Ann Dorrit
在定性研究中，样本量必须像定量研究一样确定，但方法不同。在定性研究中，流行的样本量概念是饱和。饱和与特定的方法密切相关，并且该术语的应用并不一致。我们提出了信息能力的概念，以指导足够的样本量进行定性研究。信息力量表示样本所拥有的与实际研究相关的信息越多，所需的参与者数量就越少。我们建议，具有足够信息能力的样本的大小取决于(a)研究的目的，(b)样本的特异性，(c)已建立理论的使用，(d)对话的质量，以及(e)分析策略。我们提出了一个模型，其中这些信息元素及其相关维度与信息权力相关。讨论了该模型在定性研究的规划和数据收集中的应用。
Sample sizes must be ascertained in qualitative studies like in quantitative studies but not by the same means. The prevailing concept for sample size in qualitative studies is saturation. Saturation is closely tied to a specific methodology, and the term is inconsistently applied. We propose the concept information power to guide adequate sample size for qualitative studies. Information power indicates that the more information the sample holds, relevant for the actual study, the lower amount of participants is needed. We suggest that the size of a sample with sufficient information power depends on (a) the aim of the study, (b) sample specificity, (c) use of established theory, (d) quality of dialogue, and (e) analysis strategy. We present a model where these elements of information and their relevant dimensions are related to information power. Application of this model in the planning and during data collection of a qualitative study is discussed.