english: For example, using a balance check, Allcott (2011) found some evidence that randomization was not implemented correctly in three of the Opower experiments (see table 2; sites 2, 6, and 8).
non_english: Contone, nggunakake keseimbangan, Allcott (2011) nemokake bukti yen randomisasi ora diterapake kanthi bener ing telung eksperimen Opower (pirsani tabel 2; situs 2, 6, lan 8).