Clearly, if we examined the 3,000-p

Clearly, if we examined the 3,000-plus counties in the United States, the non-attainment counties look a lot different than the attainment counties.
But if we examine counties very close to the arbitrary threshold, those attainment and non-attainment counties are much more similar.
Figure 1 shows the effects of regulation on pollution levels.

Hasil (Bahasa Indonesia) 2:

Jelas, jika kita meneliti kabupaten 3.000-plus di Amerika Serikat, negara non-pencapaian terlihat banyak berbeda dari kabupaten pencapaian.
Tetapi jika kita memeriksa kabupaten sangat dekat dengan ambang batas yang sewenang-wenang, mereka pencapaian dan non-pencapaian kabupaten jauh lebih mirip.
Gambar 1 menunjukkan efek regulasi pada tingkat polusi.