english: What has changed, however, is that the data environment in digital experiments has created new opportunities such as using machine learning methods to estimate heterogeneity of treatment effects (Imai and Ratkovic 2013).
non_english: Nanging, apa sing diganti, yaiku lingkungan data ing eksperimen digital nyiptakake kesempatan anyar kayata cara ngolah mesin kanggo ngira heterogenitas efek perawatan (Imai and Ratkovic 2013) .