Quasi-experimental designs.
Morgan
G A
GA
Colorado State University, Fort Collins, USA.
Gliner
J A
JA
Harmon
R J
RJ
D006801:Humans; D011446:Prospective Studies; D011897:Random Allocation; D016032:Randomized Controlled Trials as Topic / Q000592:standards; D012107:Research Design / Q000592:standards*