“A real-world example of using stratified sampling would be for a political survey. If the respondents needed to reflect the diversity of the population, the researcher would specifically seek to include participants of various minority groups such as race or religion, based on their proportionality to the total population as mentioned above”.
Tampaknya, langkah-langkah seperti inilah yang dilakukan oleh GRP saat memaparkan metodologinya.
Advantages : The reasons to use stratified sampling rather than simple random sampling include [1] If measurements within strata have lower standard deviation, stratification gives smaller error in estimation. [2] For many applications, measurements become more manageable and/or cheaper when the population is grouped into strata. [3] It is often desirable to have estimates of population parameters for groups within the population.
Dari bahasan sekilas di atas, publik penikmat survei-survei sosial dan politik dan para praktisi survei sosial/politik dapat menilai secara keilmuan apakah metode sampling yang digunakan GRP, seakan menerobos kelaziman selama ini, dapat dipertanggung jawabkan. Ataukah para lembaga survei politik di Indonesia yang terlena dengan copy-paste metode yang sebenarnya banyak kekurangannya dalam aspek ketelitian dan keterwakilan?
