english: This headline was based in part on estimates from non-probability samples (Mosteller 1949; Bean 1950; Freedman, Pisani, and Purves 2007).
non_english: Judhul iki adhedhasar ing prakiran saka sampel non probabilitas (Mosteller 1949; Bean 1950; Freedman, Pisani, and Purves 2007) .