"We conclude that potential utility of NPSs [nonprobability samples from commercial survey organizations] will remain out of reach unless scholars confront the tension between the operation of online survey organizations and the goals of transparent research." https://academic.oup.com/poq/article-abstract/87/3/816/7275175 #surveymethodology #surveymethods #nonprob @surveystatisticsandmethodology @surveystatsandmethodology