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Table 1 Summary of the research methods used for data collection and their relations

From: Impacts of COVID-19 and social isolation on academic staff and students at universities: a cross-sectional study

Method

Usefulness

Relation to other methods

On-line survey

Gathering of data from a wide audience in many countries

Provision of the information to be statistically processed

Non-probability sampling method I (convenience sampling)

Quick and extensive reach to research networks, especially when participants are under crisis situation

Rapid access to initial sample

Non-probability sampling method II (snow ball)

Extend sample to relevant participants within sample networks

Extend sample within networks

Dissemination via web links, networks and mailing lists sampling

Extend sample to relevant participants beyond sample networks

Extend sample beyond sample