This is in considerable contrast to other evaluation methods, where control and comparison groups are used subtractively to rule out other reasons for a finding and establish firm attribution.
By identifying control and comparison groups, we can rule out other explanations and settle on firm attribution.
Control and comparison groups generally don't have a purpose and are just used to tick boxes.
Sometimes other issues are involved besides legal ones.
This carve up of the Malay world partitioned it through the Melaka Straits.
a group of men are near bikes.
I enjoy watching MacNeil Lehrer news hour on public television.
A woman is dancing
This is the same as Germany in 1945.